/usr/include/X11/bitmaps/menu16 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 6 | #define menu16_width 16
#define menu16_height 16
static char menu16_bits[] = {
0xfc, 0x1f, 0x04, 0x10, 0x04, 0x30, 0x04, 0x30, 0xe4, 0x33, 0x04, 0x30,
0xe4, 0x33, 0x04, 0x30, 0xe4, 0x33, 0x04, 0x30, 0xe4, 0x33, 0x04, 0x30,
0x04, 0x30, 0x04, 0x30, 0xfc, 0x3f, 0xf0, 0x3f};
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