Tau Symbol Copy and Paste

Copy τ, the Greek letter tau and the symbol for torque, or take the capital Τ or a math style.

τGreek small letter tauU+03C4Ready to copy

25 tau characters and strings. Tap any value to copy it.

25 tau characters and strings. A character and its name both copy the character. A code copies the code.
Character	Name	Code point	Alt code	HTML	LaTeX
	U+03C4. The Greek alphabet's nineteenth letter, which writes the sound t. In physics it is the symbol for torque, shear stress and proper time. Alt+231 on a number pad, τ in HTML and \tau in LaTeX.
	U+03A4. The capital, drawn like a Latin T. Τ in HTML. It has no Alt code and no LaTeX macro of its own.
	U+1D70F. Small tau in italic, the slanted letter of a printed formula: U+03C4 in a math font, by its Unicode definition.
	U+1D749. Small tau in bold italic: U+03C4 in a math font, by its Unicode definition.
	U+1D6F5. Capital tau in italic, the slanted letter of a printed formula: U+03A4 in a math font, by its Unicode definition.
	Made of U+0394 and U+03C4. Capital delta and tau: an interval of proper time, the time a moving clock itself counts.
	Made of U+0064 and U+03C4. A plain d and tau: a very small step of proper time, as written inside an integral.
	Made of U+03C4, U+003D, U+0052 and U+0043. Tau, an equals sign, R and C: the time constant of a circuit is its resistance times its capacitance.
	U+0054. The Latin capital T, on every keyboard. It arose from tau, and capital tau, U+03A4, is drawn just like it.
	U+22A4. Down tack, a math and logic sign that Unicode also calls top. &top; in HTML and \top in LaTeX.
	U+1D6D5. Small tau in upright bold: U+03C4 in a math font, by its Unicode definition.
	U+1D783. Small tau in bold with no serifs: U+03C4 in a math font, by its Unicode definition.
	U+1D7BD. Small tau in bold italic with no serifs: U+03C4 in a math font, by its Unicode definition.
	U+1D6BB. Capital tau in upright bold: U+03A4 in a math font, by its Unicode definition.
	U+1D72F. Capital tau in bold italic: U+03A4 in a math font, by its Unicode definition.
	U+1D769. Capital tau in bold with no serifs: U+03A4 in a math font, by its Unicode definition.
	U+1D7A3. Capital tau in bold italic with no serifs: U+03A4 in a math font, by its Unicode definition.
	Made of U+03C4, U+03B1 and U+03C5. Tau, alpha and upsilon: the name of the letter as Greek writes it, said taf.
	U+2CA6. The Coptic letter in tau's place, named tau in Unicode. The Coptic alphabet descends from the Greek one and got code points of its own in Unicode 4.1 (2005).
	U+2CA7. Small tau, the lowercase of the Coptic tau.
	U+0422. The Cyrillic letter te, which arose from tau and writes the sound t.
	U+0442. Small te. In upright print it is a small copy of the capital.
	U+0074. The Latin small t, on every keyboard. Its cross stroke sits partway up the stem, where the bar of τ lies on top.
	U+1D1B. A Latin small capital T, a phonetic letter the height of a small letter. Added in Unicode 4.0 (2003).
	U+01AE. A Latin T with a hooked foot, a letter of African languages.

Next step τ is Alt+231: see every Alt code θ, Θ and ϑ with their codes

How it works

τ is the tau symbol: Greek small letter tau, U+03C4, the nineteenth letter of the Greek alphabet. The rows add the capital Τ, math styles such as 𝜏, Δτ and τ=RC, and the Latin T it is mistaken for.

Read the full guide

Tau is the Greek letter for t

Tau writes the sound t. The capital Τ is drawn like a Latin T but is its own character, U+03A4, where the Latin letter is U+0054. The Latin T and the Cyrillic Т both arose from tau. Theta, θ, is a different letter with its own page.

What τ stands for

In physics τ is torque, shear stress, proper time and the time constant of a circuit, as in τ=RC. It also names a particle. Some writers use τ for the circle constant equal to 2π.

LaTeX with no package has \tau for the small letter and no \Tau for the capital, which looks like a plain T.
As a Greek numeral tau stands for 300.

Questions and answers

What is the Alt code for tau?

Alt+231 types the small τ. With Num Lock on, hold Alt, type 231 on the number pad and let go. The capital Τ has no Alt code. In HTML the two are τ and Τ.

What is the torque symbol, and can I copy and paste it?

Torque is written with the small Greek letter tau, τ, U+03C4, the first row of the table. It pastes as plain text, and in LaTeX it is \tau.

How do you say the letter tau?

English says tau to rhyme with cow, or like the word taw. Greek says taf and writes the name ταυ.

All 25 tau characters and strings

Start here 10

Delta tau Made of U+0394 and U+03C4. Capital delta and tau: an interval of proper time, the time a moving clock itself counts.
Differential of tau Made of U+0064 and U+03C4. A plain d and tau: a very small step of proper time, as written inside an integral.
Down tack U+22A4. Down tack, a math and logic sign that Unicode also calls top. &top; in HTML and \top in LaTeX.
Greek capital letter tau U+03A4. The capital, drawn like a Latin T. Τ in HTML. It has no Alt code and no LaTeX macro of its own.
Greek small letter tau U+03C4. The Greek alphabet's nineteenth letter, which writes the sound t. In physics it is the symbol for torque, shear stress and proper time. Alt+231 on a number pad, τ in HTML and \tau in LaTeX.
Latin capital letter T U+0054. The Latin capital T, on every keyboard. It arose from tau, and capital tau, U+03A4, is drawn just like it.
Mathematical bold italic small tau U+1D749. Small tau in bold italic: U+03C4 in a math font, by its Unicode definition.
Mathematical italic capital tau U+1D6F5. Capital tau in italic, the slanted letter of a printed formula: U+03A4 in a math font, by its Unicode definition.
Mathematical italic small tau U+1D70F. Small tau in italic, the slanted letter of a printed formula: U+03C4 in a math font, by its Unicode definition.
RC time constant Made of U+03C4, U+003D, U+0052 and U+0043. Tau, an equals sign, R and C: the time constant of a circuit is its resistance times its capacitance.

Show all 25 tau characters and strings (15 more)

Small tau τ 3

Mathematical bold small tau U+1D6D5. Small tau in upright bold: U+03C4 in a math font, by its Unicode definition.
Mathematical sans-serif bold italic small tau U+1D7BD. Small tau in bold italic with no serifs: U+03C4 in a math font, by its Unicode definition.
Mathematical sans-serif bold small tau U+1D783. Small tau in bold with no serifs: U+03C4 in a math font, by its Unicode definition.

Capital tau Τ 4

Mathematical bold capital tau U+1D6BB. Capital tau in upright bold: U+03A4 in a math font, by its Unicode definition.
Mathematical bold italic capital tau U+1D72F. Capital tau in bold italic: U+03A4 in a math font, by its Unicode definition.
Mathematical sans-serif bold capital tau U+1D769. Capital tau in bold with no serifs: U+03A4 in a math font, by its Unicode definition.
Mathematical sans-serif bold italic capital tau U+1D7A3. Capital tau in bold italic with no serifs: U+03A4 in a math font, by its Unicode definition.

Tau in formulas 1

Tau in Greek Made of U+03C4, U+03B1 and U+03C5. Tau, alpha and upsilon: the name of the letter as Greek writes it, said taf.

Tau in other alphabets 4

Coptic capital letter tau U+2CA6. The Coptic letter in tau's place, named tau in Unicode. The Coptic alphabet descends from the Greek one and got code points of its own in Unicode 4.1 (2005).
Coptic small letter tau U+2CA7. Small tau, the lowercase of the Coptic tau.
Cyrillic capital letter te U+0422. The Cyrillic letter te, which arose from tau and writes the sound t.
Cyrillic small letter te U+0442. Small te. In upright print it is a small copy of the capital.

Look-alikes that are not tau 3

Latin capital letter T with retroflex hook U+01AE. A Latin T with a hooked foot, a letter of African languages.
Latin letter small capital t U+1D1B. A Latin small capital T, a phonetic letter the height of a small letter. Added in Unicode 4.0 (2003).
Latin small letter T U+0074. The Latin small t, on every keyboard. Its cross stroke sits partway up the stem, where the bar of τ lies on top.

How this list was compiled: Names, and the code points they belong to, are from UnicodeData.txt, version 18.0.0 (https://www.unicode.org/Public/18.0.0/ucd/UnicodeData.txt), printed in sentence case; its decomposition field is what says a math alphabet character is a plain letter in a font, or that an accented letter is a letter plus its marks. Aliases, notes and cross-references are from NamesList.txt of the same version (https://www.unicode.org/Public/18.0.0/ucd/NamesList.txt), the version a character was added in is from DerivedAge.txt (https://www.unicode.org/Public/18.0.0/ucd/DerivedAge.txt), and the years are from https://www.unicode.org/history/publicationdates.html. Alt codes are from the code page 437 table (https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT). HTML entity names are from https://html.spec.whatwg.org/entities.json, the shortest standard name first. LaTeX macros are listed only when LaTeX's own fontdef.dtx (https://github.com/latex3/latex2e/tree/develop/base) declares them, matched to a code point through unicode-math-table.tex (https://github.com/latex3/unicode-math). A cell is empty where no such method exists. What tau is for, as https://en.wikipedia.org/wiki/Tau records it: the nineteenth letter, the numeral value 300, torque, shear stress, proper time, the time constant of a circuit, the particle named tau, the circle constant equal to two pi, the two English ways and the Greek way of saying the name, the Latin T and Cyrillic te that arose from tau, and the Latin T with a hook that the article tells apart from it. Torque written with the small tau: https://en.wikipedia.org/wiki/Torque. Proper time and its interval: https://en.wikipedia.org/wiki/Proper_time. The time constant of a resistor and capacitor circuit: https://en.wikipedia.org/wiki/RC_time_constant. The Coptic alphabet as a descendant of the Greek one, given code points of its own in Unicode 4.1: https://en.wikipedia.org/wiki/Greek_alphabet. Listed: the two letters, the ten math alphabet forms, the Coptic and Cyrillic letters, five characters it is mistaken for, and this site's own strings of two to four characters, each written the way a source writes it. Left out: the other Greek letters (each has its own page), the string for tau as two pi, which the pi page has, the tau cross and the tau rho monogram, which are religious signs, and the letters of other scripts that only share the name. The Start here group, the made rows and the order are this site's own choice. All sources were read on 1 October 2026; Wikipedia text is CC BY-SA 4.0 and restated in this site's own words. Licence: own work (facts from the Unicode Character Database, Unicode License v3, and from Wikipedia, CC BY-SA 4.0, restated in this site's own words; aliases and notes marked as Unicode's are quoted from NamesList.txt, Copyright © 1991-2026 Unicode, Inc., https://www.unicode.org/license.txt)