This is a long (almost 6′ / 2m) clamp. Its similar in function to a US pipe clamp but the main body is a wood block, with notches cut or drilled.
In the UK I’ve seen the term "sash clamp" used, but those that I saw had entirely metal bodies, and I’ve never heard that term used in the US.
Grizzly sells a similar clamp and calls it a sash clamp:
The same term turns up several similar models at Amazon and other retailers.
Yours is obviously not a pipe clamp as there's no actual pipe involved, but pipe clamps are also effectively the same thing: a head with a screw at one end, and a moveable foot that a slides along a pipe or bar.
Your clamp might also be described as a bar clamp, but I've seen people also use that term for F-clamps and Bessey-style parallel jaw clamps, both of which have the screw on the movable part instead of the fixed part.
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