It probably refers to the origin of the term OK during the war in the United States, on which there are two versions. The first says that during the US civil war (1861-1865), when troops returned from a fight, officers were responsible for making a report. When there was no casualties (soldiers killed), they wrote on a chalkboard quot; 0 Killed quot; (zero dead). With the time, this term is developed in OK. Another version says that during the war of independence, had troops of Hessen which Supreme Commander (Ober Kommandant in German), signed the parts of war with the initials OK.
Anglicism which expresses conformity: Yes, vale, of agreement, I think either. In Madrid some young castellanizan it in okis so that it is not so dry. Seems to have origin military and 19th century, as the U.S. military ended its reports after some battles with these acronyms: or K. I.e., 0 killed, zero dead.
