MZ

1.	(standard, file-format)	MZ - The file signature of an MS-DOS executable (.EXE) file (0x4d 5a), always the first two bytes of the file. It was reportedly invented by, and named after, a Microsoft programmer, Mark Zbikowski. In Unix systems, the string MZ is the magic number that identifies an MS-DOS EXE file.
2.	(networking)	mz - The country code for Mozambique.

Mark Zbikowski (MS-DOS, MCB)