What is the alpha symbol?

Alpha is the first letter of the Greek alphabet, written Α in uppercase and α in lowercase. It is used across math, physics, statistics, and engineering to represent angles, coefficients, and significance levels.

How do I type the alpha symbol on a keyboard?

On Windows, hold Alt and type 224 on the numeric keypad for lowercase α. On Mac, press Option+A. You can also copy it directly from this page.

What is the Unicode code point for alpha?

Lowercase alpha is U+03B1 (GREEK SMALL LETTER ALPHA) and uppercase Alpha is U+0391 (GREEK CAPITAL LETTER ALPHA).

What is the LaTeX command for alpha?

Use \alpha in math mode to render the lowercase letter (α). Uppercase Alpha looks identical to the Latin letter A, so LaTeX has no separate command; just type A.

What does alpha mean in statistics?

In hypothesis testing, alpha (α) is the significance level, the probability of rejecting a true null hypothesis. A common choice is α = 0.05, meaning a 5 percent chance of a false positive.

What does alpha mean in physics?

Alpha commonly denotes angular acceleration, a decay constant, or an alpha particle (a helium nucleus emitted in radioactive decay), depending on the context of the equation.

Alpha Symbol

Name: Alpha Symbol
Availability: InStock
Author: Nham Vu

Click the alpha symbol (α) to copy it, or copy its uppercase form, Unicode, HTML entity, LaTeX, and Alt code formats.

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Greek small letter alpha (U+03B1)

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Codes & Formats

Unicode code point

U+03B1

HTML entity (named)

HTML entity (numeric)

CSS / JS escape

\03B1

LaTeX command

\alpha

Windows Alt code

Alt + 224

Mac shortcut

Option + A

Common Uses

Math & Geometry

sin(α), angle α

Statistics

α = 0.05 (significance level)

Physics

α-particle, angular acceleration

Finance & Naming

Alpha release, portfolio alpha

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Summary

Click the alpha symbol (α) to copy it, or copy its uppercase form, Unicode, HTML entity, LaTeX, and Alt code formats.

How it works

Click the large α symbol to copy the lowercase letter to your clipboard.
Click the uppercase Α button if you need the capital form instead.
Pick a code format (Unicode, HTML, LaTeX, Alt code) and click its copy button.
Paste the copied symbol or code into your document, spreadsheet, or code editor.

Use cases

Write an angle label in a geometry or trigonometry problem, such as sin(α).
Denote a significance level in a statistics report, such as α = 0.05.
Reference a coefficient or decay constant in a physics or engineering formula.
Add the Unicode or HTML entity code to a web page, LaTeX paper, or spreadsheet.
Type the Greek letter on a device where a Greek keyboard layout is not available.
Label a variant or version, such as an "alpha" release or an alpha particle.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu