>>2887492
It's lath because it serves as a backer for plaster to mechanically bond to. There's also wire / expanded metal lath.
Wood lath came first (and is a modernized version of woven sticks known as wattle) , rock lath was the interim step between wood lath/plaster and drywall, which got that name because there's no wet plaster layer involved.

Rock lath was most popular from around the 30s- early 60s but was around in the WW1 era. Some of it didn't have the holes and there's also various finishes that aren't straight plaster...some of which had asbestos so use caution and maybe read up on the various types and/ or see if you can find printed ID from the attic side to see if you can ID it better.

https://inspectapedia.com/interiors/Rock-Lath.php

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How can I cut this plaster without removing drywall underneath?