That's a bird's mouth. Schwarz' blog has a few entries on them in reference
to Chinese workbenches and his recent Roman build. Another v shaped
appliance is the doe's foot, which has had more press.

On Jan 22, 2018 6:51 AM, "William Ghio"  wrote:

I don’t know if it has any other name and am too lazy to go thru the old
books to look for it. It’s just a flat piece of wood w/ a vee cut in it.
stock is wedged in the vee w/ a shaped block and stuff is locked. Very
handy for edge planing.  Anybody else use one of these?

Here it is w/ three drawer sides being planed to a uniform height —
https://www.flickr.com/photos/77280442@N.../25963966128/in/dateposted-public/

Here it is holding a short tall piece —
https://www.flickr.com/photos/77280442@N.../25963967578/in/dateposted-public/

and here it is in pieces —
https://www.flickr.com/photos/77280442@N.../25963966768/in/dateposted-public/

When not in use it hangs conveniently from a nail on the leg of the bench.
I just knock the wedge in place and hang it as a unit.

Bill
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