/plan fī(-ə)l/
[UNIX]
n. On systems that support finger, the '.plan' file in a user's home directory is displayed when the user is fingered. This feature was originally intended to be used to keep potential fingerers apprised of one's location and near-future plans, but has been turned almost universally to humorous and self-expressive purposes (like a sig block).
See Hacking X for Y.