/usr/include/X11/bitmaps/gray3 is in xbitmaps 1.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #define gray3_width 4
#define gray3_height 4
static char gray3_bits[] = {
0x01, 0x00, 0x04, 0x00};
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