/usr/share/pixmaps/nethack/pet_mark.xbm is in nethack-common 3.4.3-14.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #define pet_mark_width 16
#define pet_mark_height 16
static unsigned char pet_mark_bits[] = {
0x00, 0x00, 0x6c, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0x7c, 0x00, 0x38, 0x00,
0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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