What does HYA stand for?

Heritage Yacht Corp., Clearwater, FL - Manufacturer code for watercraft hull identification number (USCG)

High Voltage-Activated (SAUS)

Hya - Language code (ETLW)

Hyack Air Ltd. - Canada - ICAO designator (FAAC)

Hyannis - Massachusetts - Airport symbol (OAG)

Hydra - Constellation (WDAA)

Hydrus - Constellation