prefix
Description of the prefix supplementary matcher.
The 
  prefix supplementary matcher queries the prefix section of a phone.  It
   accepts a single parameter which can be either:- A single character
 - A feature set matcher
 - A phone class matcher
 
The matcher will match if any of the diacritics of the phone match the provide argument.
Search for a phone with the prefix diacritic
    
  \u02b0.:prefix("\u1d50")