What does "ISO standard equivalent" actually mean?

Question

I'm reading about comparison operators. In the documentation, Comparison Operators Modified by ANY, SOME, or ALL it says (emphasis added):

Comparison operators that introduce a subquery can be modified by the keywords ALL or ANY. SOME is an ISO standard equivalent for ANY.

What does this mean?

Answer 1

It just means that operator SOME is not some MS proprietary extension. It is part of the (ISO/ANSI) SQL standard.