What does KYN stand for?

Karolanos - Language code (ETLW)

Kentuckian - Telegraphy (PCTE)

King Yachts Inc., Mercer Island, WA - Manufacturer code for watercraft hull identification number (USCG)

Kynurenic Acid (DMAA)

Kynurenine - Biochemistry

Kyrnair - France - ICAO designator (FAAC)