What are ISO 639 language codes?

S2017639 - 639 London Buses route 639 is a Transport for London contracted bus route in London, England Running between Roehampton and Battersea, it is operated by 639ความหมาย Local 639 Health-Pension Contact Information, Contact Information, UPS Benefits for Part Time Employees, Benefit Description for Teamcare for Part Time

macau639 639 Choulou - Paphos Live outbound route map Live inbound route map Choulou - Lemona - Letymbou - Kallepeia - Tsada