What does EXU stand for?

Astro Plastics Corp., Arlington, TX - Manufacturer code for watercraft hull identification number (USCG)

Excello Corp. - NCIC boat manufacturer code (NCIC)

Excretory Urogram - Medicine (DMAA)

Execution Unit (SAUS)

Executive Transports - France - ICAO designator (FAAC)

Upjohn Co., Technical Library, Kalamazoo, MI - OCLC symbol (OCLC)