Arrows

Is it acceptable to use the same arrow icon style for two different functions on the same web page?

Is it acceptable to use the same arrow icon style for two different functions on the same web page?
  1. What is a down arrow icon called?
  2. What symbol indicates no change?
  3. Which way do accordion arrows go?

What is a down arrow icon called?

Caret (or downward-facing arrow)

What symbol indicates no change?

a thin dash (e.g. -), a thick dash (e.g.━), a (no change) label following the value. nothing at all.

Which way do accordion arrows go?

Arrow Conventions

Trees have used right-pointing arrows for closed and down-pointing arrows for opened, which, as FreshCode mentions in his answer, has been generalized to expanders.

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