/usr/share/pixmaps/nethack/pilemark.xbm is in nethack-common 3.6.0-4.
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 pilemark_width 16
#define pilemark_height 16
static unsigned char pilemark_bits[] = {
0x00, 0x00, 0x18, 0x00, 0x18, 0x00, 0x7e, 0x00, 0x7e, 0x00, 0x18, 0x00,
0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
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