spinner vs activity indicator

The question is purely about the naming. Recently I was looking for a spin开发者_运维知识库ner (that is, a numеric text box with plus and minus buttons (wikipedia)), and too many of the results were actually (ajax) activity indicators.

• is it accepted to call the activity indicator "spinner"
• is it good to do so (subjective). I think this term overloading is making it harder to find the right component

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I think the accepted name for an activity indicator is a Throbber. I've heard of Numeric UpDowns being called Spinners, because they don't necessarily contain only numbers.