Why isn there a character named “mu” in my greek font?
Adobe was thinking more of backwards compatibility than sense when they assigned the names of the greek letters in their unicode encoding. Thus the name “mu” refers to the Micro Sign (U+00B5) and not to the letter mu. They also assigned Delta to Increment, and Omega to Ohm Sign. Adobe has also decided that the character at U+03D6 (said by the Unicode consortium to refer to “GREEK PI SYMBOL”) should be named “omega1”, when “pi1” seems more appropriate.