/usr/include/X11/bitmaps/menu10 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 5 | #define menu10_width 10
#define menu10_height 10
static char menu10_bits[] = {
0xfe, 0x01, 0x02, 0x01, 0x02, 0x03, 0x32, 0x03, 0x02, 0x03, 0x32, 0x03,
0x02, 0x03, 0x02, 0x03, 0xfe, 0x03, 0xf8, 0x03};
|