As a computer fanatic, my reply would be that ddc stands for Display Data Channel. Well thats true – but it could also stands for many other things like Data Device Corporation, Dewey Decimal Classification (library classification system), Domain Development Corp.. The most interesting one I found was dopa decarboxylase (DDC Gene – aromatic L-amino acid decarboxylase) – I liked it because its impossible for me to spell it..lol.