\theta doesn't seem that bad. Typing something like \kissyface or \poop seems better than clicking around or typing a numeric code, albeit with the usual name

\theta doesn't seem that bad. Typing something like \kissyface or \poop seems better than clicking around or typing a numeric code, albeit with the usual name guessing problem. On OS X, and I assume others, you can add items to be automatically replaced, so something like "!t" could become a unicode theta if you want.