Why is it called ISO and not IOS?

I'm glad you asked? It's confusing so let me explain!

According to ISO (International Organization for Standardization), ISO is not an abbreviation. I know confusing, right? ISO is a word derived from the Greek isos, meaning "equal". The name ISO is used worldwide to denote the organization, thus avoiding the assortment of abbreviations that would result from the translation of "International Organization for Standardization" into the different national languages of members. While IOS works for English speaking countries it would be OIN in French for Organisation internationale de normalisation), so they decided to shorten isos to ISO. Comprenez-vous? 

Whatever the country, the short form of the organization's name is always ISO and now you know the rest of the story!