On certain pistol weapons throughout the Halo series, you can find Japanese, Chinese, or Korean characters.
Halo: Combat EvolvedEdit
The first character is found stamped onto the top of the ejection port. It is 七, which is shichi or nana in Japanese and qi in Chinese. It translates to the number 7.
The second character is found on the bottom of the magazine floor plate. It is 力, which is chikara in Japanese and li in Chinese. Meaning "strength" or "power," it may reference how powerful the M6D is.