Gridiron football has always been called "football." It originated as a kicking game on Ivy League campuses in the 19th century, and it began to evolve out of rugby after a standardized set of rules, based on the English rugby code, was drawn up in the 1870s. (Rugby, of course, is really "rugby football.")
The term "soccer" originated in England, coming from the "soc" in "association football." It didn't catch on there, but it became popular in places that used it to distinguish association football from other football codes. That's why it's popular in the USA and Canada (which have gridiron football), Ireland (which has Gaelic football), Australia (which has Australian rules football), and, to a lesser extent, New Zealand (where rugby union is the national sport and is often referred to simply as "football").
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An iron gate that moved vertically was called a portcullis.
Lou Gehrig of the New York Yankees was called the "Iron Horse'
Boats covered in iron are commonly referred to as ironclads.
If it drops it is called a portcullis.
Iron Age