biscuit

1.Audio. Slang term for intercom speaker station, aka biscuit station, biscuit box, squawk box.

https://4.bp.blogspot.com/-2Xalq9PDRCw/Tlbi3Jc3CjI/AAAAAAAAAI4/OQ76ZLEZMT0/s400/IMG00032.jpg


https://www.clearcom.com/wp-content/uploads/2017/11/V-Box-Front-Angle-2.jpg

See the thread http://www.controlbooth.com/forums/...r-com-speaker-station-flour-king-biscuit.html for historical background info.

2. Carpentry. Slang term for plate joiner using a football (American) shaped disc, often out of beechwood, that fits into a slot cut into lumber.

https://images.homedepot-static.com/productImages/56e303ac-c0ba-441d-b800-9b7c1613cf20/svn/dewalt-joiners-dw682k-31_1000.jpg