How can I write math symbols or Greek letters in Gmail?
The most popular answer on gmail forums seems to be type it out in word and copy and paste into gmail. http://www.google.com/support/forum/p/gmail/thread?tid=7314e7bc4a4dc7cc&hl=en
There is no one unique way to do this... but I can share what I do, personally.
Use MathJax on any site. Mathematics SE for example. Now go to any question, and type a Greek letter using MathJax. For example,
$\alpha$. In the preview, you see the rendered version of alpha. You can copy it and paste. Here's the alpha I copied:
α. Note: don't post that answer. Just quit the window.
*NIX USERS: if you have a good memory power, then memorize the unicodes of all the Greek letter. Now press Ctrl + Shift + u which brings you an underlined "u". Type the unicode and then press space. Tada! For example, I typed this using unicode:
WINDOWS USERS: there's an alt code for everything (almost). Just press
alt + the given alt code. Find the list of alt codes here.
MAC USERS: find the guide here.
Most ways of inputting these characters can be found on Wikipedia Unicode Input page.
Save time, here is a quick search list for Greek and mathematical symbols for MS Word. Copy and paste the symbols to your document. Open the Word document here:
GmailTeX does exactly what you want.
You can use Alt Codes or just this keyboard to write math symbols and greek letters