A card someone holds stating they are an organ donor (after their death)

A contactless smart card, used by Chicago Transit Authority (CTA), an operator of mass transit in Chicago. A Ventra card can be loaded with either money or a ride pass, good for unlimited rides (e.g. a 30-day pass).

(electronics, telecommunications) A modular electronic circuit designed to fit on a separate PCB and interface with a telecommunications access network.

loyalty card

A mariner's card, or compass. / A map of the ocean.

(obsolete, idiomatic) A bold front, an instance of standing one's ground.

Wire card used to cover the cylinders and slats of a carding-machine and for other purposes.

A tool for removing debris from between the teeth of a file. / A card used as part of a file system.

(uncountable) Material with embedded wire teeth used for cleaning files; card-clothing / (countable) A tool for removing debris from between the teeth of a file.

(travel, aviation) A printed card with basic entries listed for a global distribution system. / A card containing a clue.