No, It's not Mortal Kombat 5. It's just a neato code name of my real name:

Mark C. Ng

So, think 'Mark' and then say it really fast.... like the speed of sound! HAHAHA! (get it? No?!) It's Mach or short form is Mk.

Now the five is just my last name in Chinese, with a person standing on the side. (You'll have to know chinese to understand this)

Hence, MK5 And yes, I am five times the speed of sound.
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