A computer on the TV show “The Hundred” displays…

A computer on the TV show “The Hundred” displays what appears be pf(4) code that has had “pf” replaced with “kx” perhaps to make the code look related to the encryption discussion taking place in this scene. Look around line 717 of https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/net/pfvar.h?annotate=1.482.