JACK Views 9 meanings found JACK is best known as the fast‑food chain Jack in the Box, while in computing it refers to a concurrency library and it also appears in community and security contexts. Miscellaneous Just Another Contract Killer audio connection kit Community Just Arts Club For Kids Governmental Computer generated icons Joint Action Council Kannur Academic & Science Jack Audio Connection Kit Computing Just Another Concurrency Kit Java Applet Correctness Kit Business Jack In The Box, Incorporated