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A mortise lock has one or two "tongues" that enter into the frame of the door to keep the door closed, one that is pushed by a spring and moved using the handle, and the other is moved by the key. Like for example the mortise lock in this image, featuring two "tongues":

https://commons.wikimedia.org/wiki/File:Einbausich-u-schl-3.jpg

enter image description here

I didn't know what other word to use, so I was using "tongue", but I notice that's not a complete alien word for such products, some vendors include the word "tongue", for example this one: Double Tongue Shift Door Lock Furniture Cabinet Door Drawer Lock

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    "latch" and "bolt" are terms I have heard, – Jimmy Fix-it Dec 17 '18 at 0:52
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    I have also heard the term “throw” or “latch throw” – Alaska Man Dec 17 '18 at 3:07
  • Thanks. It looks like the one moved by the door handle is named "Spring Latch". – Fructibus Dec 17 '18 at 8:53

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