OK, I sort of know - but as you see references to both toe bails and heel bails, I was wondering if one was correct and the other not? Or is it possible for both to be "bails"?
A quick Google of the word origin didn't come up with anything useful, although the OED website does mention its use in reference to a crampon, but annoyingly doesn't have anything to say on which part of the binding is the bail. https://en.oxforddictionaries.com/definition/bail
It seems the word can be a bar in a stable, something to hold a cow in place for milking, in addition of course to the legal/money-, cricket-, sinking ship- or non-flying plane- senses of the word, but does anyone know how it came to be connected to crampons and, indeed, which bit of the crampon binding it should be applied to?