What does Xma stand for?

Xanthomonas Malvacaerum - Microbiology (UWER)

Extended Memory Allocation (UWER)

Martin Aviation Services - ICAO designator (FAAC)

Mushungulu - Language code (ETLW)

Omaha Fiberglass - NCIC boat manufacturer code (NCIC)

X-Ray Micro Analysis (SAUS)