CDR

CDR is an acronym with several technical meanings.

In computing, particularly the Lisp programming language, cdr (pronounced "could-er") returns all elements of a list except the first—the complement of car, which returns the first element.

In business, CDR often stands for call detail record, the data logging information about telephone calls.

In environmental contexts, CDR means carbon dioxide removal, referring to technologies and methods that extract CO2 from the atmosphere.