The appropriate sign for "corner" depends what kind of corner you are referring to. In general what you do is you use "flat"-hands ("B"-hands) to show a corner, (as in the corner of a room or the corner of a city block). However, if you are talking about the corner of a picture (on the wall) you would instead use an "L"-hand (or two index fingers) and do the sign horizontally (up in the air).
CORNER:
See animation: "corner"
The concept of "corner" has other meanings that just an actual physical corner. There is also the metaphorical meaning of "to corner someone" as in force a person into a place or situation from which they cannot escape or move away from.
CORNERED / to corner someone / to pin down someone (metaphorically) such that they must listen to you:
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Or see: https://youtu.be/ZSwTRGPja_U
Corner can also mean "a street intersection."
See: INTERSECTION
Notes: