The subject in question is a “caret”. It’s also known by the more generic word cursor (or slightly more specific “text cursor”) but seeing as there’s a specific word for the item in question it makes sense to use that, even if both are appropriate. They’re all a kind of symbol so we could just call it that. But that’s even less helpful, isn’t it.
Never seen that used in this context, but I’m sure it has lots of names.
The original patent is on cursor though. https://patents.google.com/patent/US3531796
Which is the same as the marker on a slide ruler was called.
The subject in question is a “caret”. It’s also known by the more generic word cursor (or slightly more specific “text cursor”) but seeing as there’s a specific word for the item in question it makes sense to use that, even if both are appropriate. They’re all a kind of symbol so we could just call it that. But that’s even less helpful, isn’t it.