Skald:
I googled "unicode captial <name of greek letter in words>" which led me to www.fileformat.info which has a variety of HMTL Entity encodings. Oddly I couldn't get the HTML Entity (named) version of Epsilon to work, but the HTML Entity (decimal) did ... though Epsilon is E anyway.
Interestingly, I found about 6-7 such sites I bookmarked for it (which surprisingly don't have all the entities I want) and was more wondering about whether or not the site would bork it. I found out a black box I was using for the end of /tt computer readout type posts wouldn't display right on a tablet... back when I was still using one.