small a, female, or o, male, are for th
example 47° is for 47th Stormo (this is male) (47° is read quarantasettesimo (obviously is read in italian not in english))
40° is for 40th Gruppo (this is male) (40° is read quarantesimo (idem))
363a is for 363rd Squadriglia (this is female) (is read trecentosessantatreesima)