Greek Symbol
Greek letter

Tau Symbol (τ) — Copy & Paste

Grab the tau greek symbol in one click. Pronunciation: tow / tau.

ΤUpper
τLower
Reference

Technical reference

Unicode, HTML entities, and LaTeX — tap the icon beside any value.

Uppercase Tau

Character
Τ
Unicode
U+03A4
HTML named
Τ
HTML decimal
Τ
LaTeX
T

Lowercase Tau

Character
τ
Unicode
U+03C4
HTML named
τ
HTML decimal
τ
LaTeX
\tau
Context

Common uses in science & math

Time constants & torque

Electronics uses τ for RC/RL time constants; mechanics uses τ for torque.

Proper time & lifetime

Relativity uses τ for proper time; particle physics uses τ for mean lifetime or the tau lepton.

Input

How to type Tau

Windows

Grab τ from this page for time-constant notation.

macOS

Grab τ or use Character Viewer → “tau”.

Word & Google Docs

Paste τ into circuit notes and physics homework.

Prefer a full walkthrough? Read how to type Greek letters.

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Tau FAQ

Is tau an alternative to pi?

Some educators promote τ = 2π as a turn constant. You can grab τ here if you use that convention.