AFAIK

As Far As I Know (it’s not my fault if I am wrong)

COMAND

COckpit MANagement and Data System (aka Audio 50 head unit)

D2B

Domestic Digital Bus (old fiber optic audio network aka Digital Data Bus)

DIY

Do It Yourself (or get somebody else to do it for you)

MOST

Media Oriented System Transport (new fiber optic audio network)

VCM

Voice Control Module (aka Voice Recognition,  Speech Dialog System, or Linguatronic)

VES

Video Entertainment System (buy one, your kids will love you)

WIS

Workshop Integrated System (online work instructions for MB)