What does ok stand for?

all correct (SAUS)

Ohne Kosten - Without Cost - German (AD)

Ola Kala - All is Fine - Greek (AD)

Optical Klystron (AD)

Outer Keel (AD)

Oklahoma Department of Libraries, Oklahoma City, OK - Library symbol - Library of Congress (LCLS)

All Right - From Oll Korrect; or from Old Kinderhook, a political club that supported the 1840 presidential campaign of Martin Van Buren

Approved (EBF)

Correct (EBF)

Czechia - Civil aircraft markings - international (PIPO)

Czechoslovak Airlines - ICAO designator (AD)

Kingston Public Library, Ontario - Library symbol - National Library of Canada (NLC)

Odorless Kerosene

Ohne Kosten - Without Cost - German

Ohrekreis - German license plate city code

Okay - International telex abbreviation (WDMC)

Okinawa - Japan

Oklahoma - Postal code

Okonite (IAA)

Okonomisk Kart - Okonomisk cart (GIS)

Oktal (IAA)

Ola Kala - All Is Well - Greek

Old Kent Financial - NYSE symbol

Old Khmer - Linguistics (IEL)

Old Kinderhook (IIA)

Old Kingdom - Egyptology (ROG)

Optical Klystron (PDAA)

Order of Knights (ADA)

Oskar Kokoschka - Austrian painter - 1886-1980

Osterreichische Karte - Austrian Map (GIS)

Our King (SAUS)

Outer Keel

Outkast