1) CCX x X 2) Hundredth anniversary of Y2K 3) III x DCC 4) LXXV x XXVIII 5) MMCCCX minus CCX 6) XXI x C 7) XXXV x LX 
MMC may stand for: In business: In computing: In education: Regarding hospitals and medical colleges: In medicine: In transport: In other usages: ...
Microsoft Management Console, details ...
(Digital cameras and photo printers) Multimedia Card
Multi Manufactured Capacitor, A capacitor made from many smaller Manufactured (off the shelf) capacitors.
Matched Memory Cycle + Microcomputer Marketing Council + Microsoft Management Console [Microsoft] + MultiMedia Card
Modernising Medical Careers
Metal-matrix composite.
Market Monitoring Center
Maintenance Monitoring Console
Manifold Mounted Converter
Manchester Materials Centre - also known as Manchester Materials Science Centre
Molecular Materials Centre - JV of three NW Universities
Multi-Media Card. A flash memory card used in some digicams and MP3 players. The MMC is identical in size and shape to the Secure Digital (SD) flash cards.
Main Male Character. The male lead in a romance story. Usually gets the girl in the end.