What does SOK stand for?

American Sokol Educational and Physical Culture Organization

Saale-Orla-Kreis - German license plate city code

Semongkong - Lesotho - Airport symbol - Obsolete (OAG)

Slovo o Knige - A publication

Sokolovsky - NCIC firearms make code (NCIC)

Sokoro - Language code (ETLW)

South Kauai, HI - Location identifier - FAA (FAAL)

Standard Oil of Kentucky - Federal Railroad Administration identification code

Supply OK - i.e., Authorized

It's OK - Internet lingo (NETL)