Definition: not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate; not shut or blocked; not closed.
This sign refers to an abstract concept rather than physical-related concepts. E.g. "The store opens at 7am."
Related signs: AJAR
First 100 words.
As you feel more comfortable with the first few hundreds of ASL signs, progress further with your vocabulary and learn signing more.