What does SUO stand for?

Senior Under-Officer - Royal Military Academy - British (ROG)

Shell Oil Co. - Toronto Stock Exchange symbol (SPSG)

Society of University Otolaryngologists - Later, SOU-HNS (EA)

Sunda - Language code (ETLW)

Sun River - Oregon - Airport symbol - Obsolete (OAG)

Suomi - NCIC firearms make code (NCIC)

Syncope of Unknown Origin (DB)