Bat (heraldry)
The bat (also called the reremouse, reermouse, or rearmouse) is a heraldic symbol sometimes used as a charge, but most prominently used as a crest on or around the crown in municipal arms of the former Crown of Aragon—specifically in Valencia, Catalonia and the Balearic Islands. == Origins == The heraldic use of the bat has its origins in the "royal dragon" crest (cimera reial) of the coat of arms of the Kings of Aragon.