A given name is a string of up to 31 characters.  The legal
  characters in a given name are A-Z, 0-9, _, and $.  The first
  character must be a letter from A-Z, and the last character cannot be
  _ or $.  The DMU translates all lowercase letters to uppercase.

  For example, SALES and CDD$TOP are legal given names.  S{L?S,
  however, is not a legal given name because it contains the illegal
  characters { and ?.