
Remember when Greek letters were just strange symbols you ignored in escola? Turns out, they’re the secret superheroes of engineering, math, and science! Now, instead of puzzling you, α, β, π, and λ pop up everywhere, helping us describe everything from angles and probabilities to wavelengths and constants. These little letters make complex ideas easier to handle and communicate, proving that those “weird” symbols you skipped over are actually the everyday language of the scientific world.
And because this is inovação.mundo here, this article provides clear definitions for all Greek letters used in science and math, instructions for typing them on Windows and macOS, their typical applications across fields like physics, statistics, and engineering, and a key formula example for each. It serves as a practical reference to understand the meaning and usage of these symbols in real-world contexts.
All Greek Letters & Math Symbols
*: on macOS, the Option key combinations assume the Greek Polytonic keyboard is enabled (see details below the table and other means to get them)
| English Name | Greek Letter | How to Type* | Domain Usage | Famous Formula |
|---|---|---|---|---|
| Alpha | Lower case: α | Windows: Alt + 224 | Physics: Alpha Particle, a helium nucleus emitted during radioactive decay. | Alpha decay: ({}^{A}_{Z}X rightarrow {}^{A-4}_{Z-2}Y + {}^{4}_{2}alpha) |
| Software Development: Alpha Test, the first phase of formal software testing done internally. | ||||
| Finance: Alpha, a measure of an investment’s performance compared to a benchmark. | Jensen’s Alpha: (alpha = R_i – [R_f + beta_i (R_m – R_f)]) | |||
| Organic Chemistry: Alpha Carbon, the first carbon atom attached to a functional group. | ||||
| Upper case: Α | Windows: Alt + 913 | Mathematics: Set notation, often used to denote sets or constants. | ||
| Physics: Angular acceleration, sometimes used for this quantity. | Angular acceleration: (alpha = frac{domega}{dt}) | |||
| Engenharia: Coeficiente de expansão térmica, símbolo de expansão linear. | Thermal expansion: (Delta L = alpha L_0 Delta T) | |||
| Statistics: Significance level, probability of Type I error. | Significance level: (alpha = P(text{Type I error})) | |||
| Beta | Lower case: β | Windows: Alt + 225 | Physics: Beta Particle, an electron or positron emitted in radioactive decay. | Beta decay: (n rightarrow p + e^- + bar{nu}_e) |
| Finance: Beta, a measure of a stock’s volatility relative to the market. | Beta coefficient: (beta = frac{mathrm{Cov}(R_i, R_m)}{mathrm{Var}(R_m)}) | |||
| Mathematics: Beta function, a special function in calculus. | Beta function: (B(x, y) = int_0^1 t^{x-1}(1-t)^{y-1}dt) | |||
| Upper case: Β | Windows: Alt + 914 | Mathematics: Used as a variable or constant in equations. | ||
| Engineering: Phase constant in wave equations. | Phase constant: (beta = frac{2pi}{lambda}) | |||
| Statistics: Type II error probability. | Type II error: (beta = P(text{Type II error})) | |||
| Gamma | Lower case: γ | Windows: Alt + 226 | Physics: Gamma Ray, alta energia electromagnetic radiation. | Photon energy: (E = hnu = hfrac{c}{lambda}) |
| Mathematics: Euler–Mascheroni constant, sometimes denoted by γ. | Euler–Mascheroni constant: (gamma = lim_{n to infty} left( sum_{k=1}^n frac{1}{k} – ln n right)) | |||
| Engineering: Specific weight, ratio of weight to volume. | Peso específico: (gamma = frac{W}{V}) | |||
| Statistics: Skewness, measure of asymmetry in probability distributions. | Skewness: (gamma_1 = frac{mu_3}{sigma^3}) | |||
| Upper case: Γ | Windows: Alt + 915 | Mathematics: Gamma function, generalization of factorial function. | Gamma function: (Gamma(z) = int_0^infty t^{z-1} e^{-t} dt) | |
| Physics: Lorentz factor, used in special relativity. | Lorentz factor: (gamma = frac{1}{sqrt{1 – v^2/c^2}}) | |||
| Engineering: Shear modulus, a material property. | Shear modulus: (tau = Gamma cdot theta) | |||
| Computer Science: Graph theory, denotes a graph. | ||||
| Delta | Lower case: δ | Windows: Alt + 235 | Mathematics: Kronecker delta, a function of two variables. | Kronecker delta: (delta_{ij} = begin{cases} 1 & i = j \ 0 & i neq j end{cases}) |
| Physics: Dirac delta function, a distribution with zero width and infinite height. | Dirac delta: (int_{-infty}^{infty} f(x) delta(x-a) dx = f(a)) | |||
| Economics: Depreciation rate, rate at which assets lose value. | Depreciation: (V_t = V_0 e^{-delta t}) | |||
| Engineering: Deflection, displacement in structures. | Beam deflection: (delta = frac{PL^3}{48EI}) | |||
| Upper case: Δ | Windows: Alt + 916 | Mathematics: Change or difference, as in Δx (change in x). | Difference: (Delta x = x_2 – x_1) | |
| Physics: Heat transfer, as in ΔQ (change in heat). | Heat transfer: (Delta Q = mcDelta T) | |||
| Química: Mudança de reação, como em ΔH (mudança na entalpia). | Enthalpy change: (Delta H = H_{text{products}} – H_{text{reactants}}) | |||
| Finance: Delta, sensitivity of option price to underlying asset price. | Option delta: (Delta = frac{partial V}{partial S}) | |||
| Epsilon | Lower case: ε | Windows: Alt + 238 | Mathematics: Arbitrarily small positive quantity, used in limits. | |
| Physics: Permittivity, as in ε₀ (vacuum permittivity). | Coulomb’s law: (F = frac{1}{4pivarepsilon_0} frac{q_1 q_2}{r^2}) | |||
| Engineering: Strain, deformation per unit length. | Strain: (varepsilon = frac{Delta L}{L_0}) | |||
| Upper case: Ε | Windows: Alt + 917 | Mathematics: Used as a variable or constant. | ||
| Physics: Electric field strength. | Electric field: (vec{E} = frac{vec{F}}{q}) | |||
| Statistics: Expected value operator (rarely). | ||||
| Zeta | Lower case: ζ | Windows: Alt + 950 | Mathematics: Riemann zeta function, important in number theory. | Riemann zeta: (zeta(s) = sum_{n=1}^infty frac{1}{n^s}) |
| Physics: Damping ratio, in oscillatory systems. | Damping ratio: (zeta = frac{c}{2sqrt{mk}}) | |||
| Upper case: Ζ | Janelas: Alt + 918 | Mathematics: Used as a variable or constant. | ||
| Physics: Atomic number (rarely). | ||||
| Eta | Lower case: η | Windows: Alt + 951 | Physics: Efficiency, ratio of output to input. | Efficiency: (eta = frac{P_{text{out}}}{P_{text{in}}}) |
| Mecânica dos Fluidos: Dynamic viscosidade. | Viscosity: (tau = eta frac{du}{dy}) | |||
| Upper case: Η | Windows: Alt + 919 | Mathematics: Used as a variable or constant. | ||
| Physics: Enthalpy (rarely). | Enthalpy: (H = U + pV) | |||
| Theta | Lower case: θ | Windows: Alt + 952 | Mathematics: Angle, especially in polar coordinates. | Polar coordinates: (x = rcostheta,, y = rsintheta) |
| Physics: Temperature difference (sometimes). | ||||
| Statistics: Parameter in probability distributions. | ||||
| Upper case: Θ | Windows: Alt + 920 | Mathematics: Asymptotic tight bound in Big Theta notation. | Big Theta: (f(n) = Theta(g(n))) | |
| Física: Temperatura potencial. | Potential temperature: (theta = T left(frac{p_0}{p}right)^{R/c_p}) | |||
| Engineering: Used as a variable or constant. | ||||
| Iota | Lower case: ι | Windows: Alt + 953 | Mathematics: Inclusion map in topology. | |
| Upper case: Ι | Mathematics: Used as a variable or constant. | |||
| Kappa | Lower case: κ | Windows: Alt + 954 | Physics: Thermal conductivity. | Thermal conductivity: (q = -kappa nabla T) |
| Mathematics: Curvature of a curve. | Curvature: (kappa = left|frac{dmathbf{T}}{ds}right|) | |||
| Upper case: Κ | Windows: Alt + 922 | Mathematics: Used as a variable or constant. | ||
| Physics: Dielectric constant (rarely). | ||||
| Lambda | Lower case: λ | Windows: Alt + 955 | Physics: Wavelength of a wave. | Wavelength: (lambda = frac{v}{f}) |
| Mathematics: Eigenvalue in linear algebra. | Eigenvalue equation: (Amathbf{v} = lambdamathbf{v}) | |||
| Computer Science: Lambda calculus, anonymous function. | Lambda abstraction: (lambda x. x^2) | |||
| Maiúsculas: Λ | Windows: Alt + 923 | Physics: Cosmological constant in general relativity. | Einstein’s Field Equations: (R_{munu} – frac{1}{2}g_{munu}R + Lambda g_{munu} = frac{8pi G}{c^4}T_{munu}) | |
| Mathematics: Used as a variable or constant. | ||||
| Statistics: Wilks’ lambda, test statistic. | ||||
| Mu | Lower case: μ | Windows: Alt + 230 | Physics: Coefficient of friction. | Friction: (F = mu N) |
| Statistics: Population mean. | Population mean: (mu = frac{1}{N}sum_{i=1}^N x_i) | |||
| Upper case: Μ | Windows: Alt + 924 | Mathematics: Used as a variable or constant. | ||
| Physics: Magnetic dipole moment (rarely). | ||||
| Nu | Lower case: ν | Windows: Alt + 957 | Physics: Frequency of a wave. | Frequency: (nu = frac{c}{lambda}) |
| Fluid Mecânica: Kinematic viscosity. | Kinematic viscosity: (nu = frac{mu}{rho}) | |||
| Upper case: Ν | Windows: Alt + 925 | Mathematics: Used as a variable or constant. | ||
| Physics: Number of particles (rarely). | ||||
| Xi | Lower case: ξ | Windows: Alt + 958 | Mathematics: Random variable in probability theory. | |
| Physics: Damping ratio (sometimes). | ||||
| Upper case: Ξ | Windows: Alt + 926 | Physics: Cascade particle in particle physics. | ||
| Mathematics: Used as a variable or constant. | ||||
| Omicron | Lower case: ο | Windows: Alt + 959 | Mathematics: Used as a variable or constant (rarely). | |
| Upper case: Ο | Mathematics: Used as a variable or constant (rarely). | |||
| Pi | Lower case: π | Windows: Alt + 227 | Mathematics: Pi, the ratio of a circle’s circumference to its diameter. | Circle circumference: (C = 2pi r) |
| Statistics: Product operator (capital pi notation). | ||||
| Physics: Pion, a type of subatomic particle. | ||||
| Upper case: Π | Windows: Alt + 928 | Matemática: Operador de produto (notação pi maiúsculo). | Product notation: (prod_{i=1}^n a_i) | |
| Physics: Osmotic pressão. | Osmotic pressure: (Pi = iMRT) | |||
| Computer Science: Projection operator in relational algebra. | ||||
| Rho | Lower case: ρ | Windows: Alt + 961 | Physics: Density of a substance. | Density: (rho = frac{m}{V}) |
| Mathematics: Correlation coefficient. | Pearson correlation: (rho = frac{mathrm{Cov}(X,Y)}{sigma_X sigma_Y}) | |||
| Upper case: Ρ | Windows: Alt + 929 | Mathematics: Used as a variable or constant. | ||
| Physics: Resistivity (rarely). | Resistivity: (R = rho frac{L}{A}) | |||
| Sigma | Lower case: σ | Windows: Alt + 963 | Mathematics: Standard deviation in statistics. | Standard deviation: (sigma = sqrt{frac{1}{N}sum_{i=1}^N (x_i – mu)^2}) |
| Physics: Electrical conductivity. | Conductivity: (J = sigma E) | |||
| Engineering: Estresse in materials. | Stress: (sigma = frac{F}{A}) | |||
| Final lower case: ς | Windows: Alt + 962 | Língua grega: usada como forma final de sigma no final das palavras. | ||
| Upper case: Σ | Windows: Alt + 228 | Mathematics: Summation operator. | Summation: (sum_{i=1}^n a_i) | |
| Physics: Surface density. | ||||
| Computer Science: Alphabet of a formal language. | ||||
| Tau | Lower case: τ | Windows: Alt + 964 | Physics: Time constant in RC circuits. | RC time constant: (tau = RC) |
| Mathematics: Divisor function. | ||||
| Upper case: Τ | Windows: Alt + 932 | Mathematics: Used as a variable or constant. | ||
| Physics: Kinetic energy (rarely). | ||||
| Upsilon | Lower case: υ | Windows: Alt + 965 | Physics: Specific volume. | Specific volume: (upsilon = frac{V}{m}) |
| Mathematics: Used as a variable or constant. | ||||
| Upper case: Υ | Windows: Alt + 933 | Physics: Upsilon meson, a subatomic particle. | ||
| Mathematics: Used as a variable or constant. | ||||
| Phi | Minúscula: φ | Windows: Alt + 966 | Mathematics: Euler’s totient function. | Euler’s totient: (varphi(n) = n prod_{p|n} left(1 – frac{1}{p}right)) |
| Physics: Magnetic flux. | Magnetic flux: (Phi = int vec{B} cdot dvec{A}) | |||
| Mathematics: Golden ratio (sometimes). | Golden ratio: (varphi = frac{1+sqrt{5}}{2}) | |||
| Upper case: Φ | Windows: Alt + 934 | Physics: Electric potential. | Electric potential: (Phi = frac{1}{4pivarepsilon_0} int frac{rho(mathbf{r’})}{|mathbf{r} – mathbf{r’}|} d^3r’) | |
| Mathematics: Cumulative distribution function (sometimes). | Normal CDF: (Phi(x) = frac{1}{sqrt{2pi}} int_{-infty}^x e^{-t^2/2} dt) | |||
| Engineering: Work function in electronics. | ||||
| Chi | Lower case: χ | Windows: Alt + 967 | Statistics: Chi-squared distribution. | Chi-squared: (chi^2 = sum_{i=1}^n frac{(O_i – E_i)^2}{E_i}) |
| Mathematics: Characteristic function in group theory. | ||||
| Upper case: Χ | Windows: Alt + 935 | Mathematics: Used as a variable or constant. | ||
| Physics: Electric susceptibility. | Susceptibility: (chi = frac{M}{H}) | |||
| Psi | Lower case: ψ | Janelas: Alt + 968 | Physics: Wave function in quantum mechanics. | Schrödinger Equation: (ihbarfrac{partial}{partial t}Psi(mathbf{r},t) = left[-frac{hbar^2}{2m}nabla^2 + V(mathbf{r},t)right]Psi(mathbf{r},t)) |
| Mathematics: Digamma function. | Digamma: (psi(x) = frac{d}{dx} ln Gamma(x)) | |||
| Upper case: Ψ | Windows: Alt + 936 | Physics: Water potential in plant physiology. | ||
| Mathematics: Used as a variable or constant. | ||||
| Omega | Lower case: ω | Windows: Alt + 969 | Physics: Angular frequency. | Angular frequency: (omega = 2pi f) |
| Mathematics: Smallest infinite ordinal number. | ||||
| Electrical Engineering: Ohm, unit of electrical resistance. | ||||
| Upper case: Ω | Windows: Alt + 234 | Physics: Ohm, unit of electrical resistance. | ||
| Mathematics: Sample space in probability theory. | ||||
| Physics: Solid angle (steradian). | Solid angle: (Omega = frac{A}{r^2}) |
Methods To Insert Greek Letters and Symbols
- The Unicode Standard: both operating systems are built on the Unicode standard.
- The Code Points: the specific code for any given character is identical. U+03C0 will always represent the lowercase Greek letter Pi (π) on any modern device.
- File Compatibility: if you type a document containing Unicode characters (like π, Σ, or emojis) on a Windows PC, save it, and then open it on a Mac, the characters will appear correctly, and vice-versa.
The main differences are the tools and methods you use to enter the codes and how the characters are rendered on screen :
| Windows | macOS | |
| Direct Code Entry | Alt + X (in supported apps like Word) or a system-wide Registry change for Hex Numpad input. | Layout de teclado “Unicode Hex Input” para todo o sistema (opção + código hexadecimal). |
| Character Utility | Character Map: A utility to find, copy, and paste characters. | Character Viewer: A more integrated tool (Control+Command+Space) to search, find, and insert characters. |
| Keyboard Shortcuts | Alt Codes (Alt + numeric keypad) for a limited set of characters. | Option Key Combos (Option + letter) for a different set of common symbols. |
| Fonts (Rendering) | Uses its own set of default system fonts (like Segoe UI, Calibri, Times New Roman). | Uses its own default system fonts (like San Francisco, Helvetica, Geneva). |
The Unicode standard itself is universal. A character is a character, no matter the platform. The only thing that changes is the método you use to type it, described hereahter. You just need to learn the specific “how-to” for the operating system you are currently using.
Windows Greek Letters/Symbols How-Tos
- hold the ALT key + type code given in the table above: this method is application dependent, so main not work everywhere.
- the Emoji & Symbol Picker (Windows 10 and 11): o Windows key + . (period) or Windows key + ; (semicolon) to open the panel, the navigate to the “Symbols” tab to find the Unicode characters, including currency, math symbols, and Greek letters
- Character Map: open Character Map app, select the Greek letter, copy and paste it.
- Unicode input: type the Unicode code point (e.g., 03B1 for α), then press Alt + X in some applications like Microsoft Word.
- Microsoft Word “Insert Symbol”: Go to Insert > Symbol > More Symbols, select the Greek block, and insert the desired letter.
- Keyboard layout switch: install and switch to a Greek keyboard layout via Windows settings to type Greek letters directly.
- AutoCorrect in Word: use predefined shortcuts (e.g., typing “alpha” converts to α) if enabled. The full list is below:
All AutoCorrect Math Symbols in MS Word
Dica: no MS Word, se você conhece o nome grego e não precisa de versões maiúsculas e minúsculas, este é o método mais eficiente.
| \alpha → α | \beta → β | \gamma → γ | \delta → δ | \epsilon → ε | \zeta → ζ |
| \eta → η | \theta → θ | \iota → ι | \kappa → κ | \lambda → λ | \mu → μ |
| \nu → ν | \xi → ξ | \pi → π | \rho → ρ | \sigma → σ | \tau → τ |
| \upsilon → υ | \phi → φ | \chi → χ | \psi → ψ | \omega → ω |
And Other Math Symbols:
| \infty → ∞ | \partial → ∂ | \nabla → ∇ | \times → × | \div → ÷ | \pm → ± |
| \leq → ≤ | \geq → ≥ | \neq → ≠ | \approx → ≈ | \equiv → ≡ | \rightarrow → → |
| \leftarrow → ← | \Rightarrow → ⇒ | \Leftarrow → ⇐ | \leftrightarrow → ↔ | \cdot → · | \degree → ° |
macOS Greek Letters/Symbols How-Tos
- Option Key Shortcuts (described in the table above): hold Option and press a specific key (e.g., Option + A for α).
- Character Viewer: press Control + Command + Espaço, search for Greek letters, and insert them.
- Unicode Hex Input (also described in the table): enable Unicode Hex Input keyboard, hold Option and type the Unicode code (e.g., Option + 03B1 for α).
- Keyboard Viewer: enable and use Keyboard Viewer to find and type Greek letters.
- Text replacements: set up custom text replacements in System Preferences > Keyboard > Text (e.g., type “alpha” to get α).
- Math or science apps: use built-in symbol palettes in apps like Pages, Keynote, or Microsoft Word for Mac.
If you use extensively complex formulas in your documents, we recommend these 2 articles on Látex:


External Links on Official Math Symbols
Normas internacionais
(Passe o cursor sobre o link para ver nossa descrição do conteúdo)










