There's a standard extending text to more than 256 different characters called Unicode. One section of Unicode contains characters for the International Phonetic Alphabet, which are mostly just slightly modified versions of Latin or Greek letters, including the turned r ( ɹ ) which makes the sound an r in English makes (not trilled), and apparently a turned m and y, although I don't know what sounds those make. The turned e is called a schwa. It's a general phonetic symbol for an unstressed vowel. The turned d, n, u and p are just p, u, n and d, respectively. The i is a "dotless I" that's in Unicode for reasons I don't know. The o is, well, an o!
Oh, hmm, that's a bit outdated. I know what the turned m sounds like now