Optical Network Terminal, an interface between a telecom company's fiber optic line leading up to a building and one or more wiring networks within the building

Optical Network Terminal - converts light pulses from a fiber optic line to electrical pulses. Reference FTTP

Ontario Northland Railway

ortho-nitrotoluene

Organización Nacional de Trasplantes, the Spanish Transplant Organization

LA/Ontario International Airport (IATA code)

Ordo Novi Templi "Order of the New Templars", an occult anti-semitic society founded 1907 by Lanz von Liebenfels

Ontario Network Television, the main predecessor of the now-defunct Baton Broadcast System