Bob,(posted 8166 days ago)You are right. The standard is set by the International Standards Organization. It's not based on the 0.1 over b+f standard, that's your EI which is a completely different thing.
Some certain manufacturers that put their film in a yellow box hold fast to the ISO standard and are apparently ignorant of the fact that for most photographers it's only a starting point.
On the other hand, notice that Ilford and Bergger and others don't refer to ISO numbers. They call them EIs when they use any term at all. For example, Ilford doesn't make any claim that FP4+ is a 125 film period. They recommend 125 as a starting point and offer development times for 50 and 200 as well.