The MathJax help says writing \tau between $..$ gives $\tau$ but for capital "tau", $\Tau$ does not work. How would one write a capital tau in MathJax?

  • 6
    $\begingroup$ Capital Tau in Greek is T. Sure this is useful? en.wikipedia.org/wiki/Tau $\endgroup$
    – Did
    Nov 24, 2015 at 8:43
  • 6
    $\begingroup$ Actually, @Did, what you wrote was a capital Latin "tee". Here is a capital tau: Τ. $\endgroup$
    – user642796
    Nov 24, 2015 at 8:50

1 Answer 1


Several Greek letters are essentially indistinguishable from Latin letters, and LaTeX (and therefore MathJax) doesn't have separate handling for them for historical reasons, see this question on Tex.SE.

What you can do is find a "capital tau" somewhere on the internet, such as here: Τ. Now copy and paste it in between two $s, like this $Τ$,* and note that it renders as


It's a bit upright, so why not italicise it with $\it Τ$ to yield

$\it Τ$

And then look at how it differs from $T$ (that's a capital Latin tee)


Not much of a difference, is there?

* Alternatively, you can use the \unicode{} command, where the argument is the Unicode code point — either decimal or hexidecimal — of the desired character. Capital tau has Unicode code point 932 (decimal) or x03A4 (hexadecimal), so both $\unicode{932}$ and $\unicode{x03A4}$ should produce a captial tau.

  • $\begingroup$ The fact that they actually bothered to make a capital tau symbol surprises me... $\endgroup$
    – AvZ
    Nov 25, 2015 at 17:19
  • 3
    $\begingroup$ @AvZ: For the Greek letters? Unicode has those because it makes it possible to automatically convert from capital to lowercase - otherwise, both $\tau$ and $t$ would be possible options when converting $T$ to lowercase and it would be a lot more of a headache than it is now. $\endgroup$
    – Deusovi
    Dec 4, 2015 at 1:05

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