= F =
[uncommon, U.K.; originally a serendipitous
typo in 1994] A pointer to a function in C and C++. By association
with sub-atomic particles such as the neutrino, it accurately
conveys an impression of smallness (one pointer is four bytes on
most systems) and speed (hackers can and do use arrays of functinos
to replace a switch() statement).
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.