A keypad. It appears to be built out of the insert/home/pageup, arrow keys, and numpad part of a keyboard, but instead it has letters. the insert/home/pageup cluster is S/R/Q/V/U/T, the arrow keys are W/Z/Y/X, and the numpad is P/O/N/M/G/H/I/L/D/E/F/A/B/C/K/J/? there's 3 black keys above S/R/Q which are unlabeled, and to the right of them a wide unlabeled grey key, and another unlabeled black key it has an XT/AT keyboard connector
https://digipres.club/system/media_attachments/files/112/282/318/606/931/290/original/2b2f6b1e93a41c22.webp