* Birds of a Feather: This idiom is a shortening of the proverb "birds of a feather flock together", meaning that people (birds) of the same kind or interest (of a common feather) enjoy spending time (flocking) together. This proverb is believed to date back as far as Greek and Roman times, but has become commonly used as jargon by various groups since the nineteenth century.
* The acronym is used by the Internet Engineering Task Force (IETF) to denote initial meetings of members interested in a particular issue. The term is also used by computer science professionals at gatherings such as industry conferences to describe a meeting in which a topic of specific interest is discussed. Such meetings are referred to as Birds-of-a-Feather Meetings, or simply as BoFs.