Mystic lines in INDEX.fonts files

I

Igor2022

I wonder what do the following lines mean:

Code: 
# (fset 'langnew
#   "\M-}\C-p\C-k\C-y\C-m\C-y\M-}")

They can be found in /boot/fonts/INDEX.fonts, /usr/share/vt/fonts/INDEX.fonts and /usr/share/syscons/fonts/INDEX.fonts in many FreeBSD releases (at least 13.0 through 14.3).
Obviously, they are comments. But unlike other comments in font index files, these lines make no sense to me. So I'm curious. Googling "fset langnew" hasn't produced anything useful...

Edit: If git blame can be trusted, these lines were introduced in 1995 in this commit. Still that commit doesn't give a clue.
 
From emacs to English that should be:

set a symbol's function definition 'prefix_command / forward paragraph, backward line, to end of line, yank back last thing killed, IDK about 'C-m' without another key following 'm'?

Excellent catch Igor2022, it's not so easy to completely deGNU FreeBSD src.
 
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