Lib is used in the names of some movements that are concerned with achieving social and legal freedom for particular groups in society. Lib is an abbreviation for `liberation'. Women's Lib. see also ad-lib. A movement that seeks to achieve equal rights for a group; liberation. the written abbreviation of liberal. ad-lib, women's lib
This is a generic sort of extension indicating some sort of hexadecimal (or even binary) data; of particular note though is that interactive fiction data files for use with the Hugo program typically use this extension