Question: I thought about posting this in woodworking, but everything there seems to be related to actual problems in carpentry.

I'm trying to describe a kitten’s behaviour: **Frisky's so desperate for an opponent to wrestle with, even the [wall corner] will do.** I want to know if there's a technical term for this kind of corner. I already tried searching here and also googling ***convex corner***, ***corner facing out***, and ***wall corner facing out***, all without finding the sought after term.

Here's a picture of the actual thing:

[![enter image description here](https://i.stack.imgur.com/qHfJU.jpg)](https://i.stack.imgur.com/qHfJU.jpg)

Answer: 
There is a word *quoin* or *coign*, which were originally variants of *coin* but relate to corner. [Per the OED](http://www.oed.com/view/Entry/156875?rskey=8OELwH&result=1&isAdvanced=false#eid):

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> 1. *Building*.
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> 	* a. Originally: an external angle of a wall; an outer corner of a building. Subsequently also: any of the stones or bricks serving to form this angle; a cornerstone. Cf. *coin* *n*. 1.
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> 	> Esp. used of cornerstones of a material or decoration differing from that of the rest of the wall.
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> 	* b. An internal angle or corner of a wall, esp. of a room. Also: a recess in a wall, as for a gate; = *hollow quoin* n. at *hollow* adj. and adv. Special uses 3b.
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The *coign* version is less often seen these days. The OED says that when it means the same as *quoin*, then *quoin* is the ordinary modern spelling.

Various other specialized senses of *quoin* exist, but this is the oldest of them all.
Angular - having angles or sharp corners <https://dictionary.cambridge.org/dictionary/english/angular>