Ken Iverson, the inventor of APL, has been credited with a one-liner that, given a number N, produces a list of the prime numbers from 1 to N inclusive. It looks like this:
(2 = 0 +.= T o.| T) / T <- iN
where `o' is the APL null character, the assignment arrow is a single character, and `i' represents the APL iota.
:ooblick: /oo'blik/ /n./ [from the Dr. Seuss title "Bartholomew and the Oobleck"; the spelling `oobleck' is still current in the mainstream] A bizarre semi-liquid sludge made from cornstarch and water. Enjoyed among hackers who make batches during playtime at parties for its amusing and extremely non-Newtonian behavior; it pours and splatters, but resists rapid motion like a solid and will even crack when hit by a hammer. Often found near lasers.
Here is a field-tested ooblick recipe contributed by GLS:
1 cup cornstarch 1 cup baking soda 3/4 cup water N drops of food coloring
This recipe isn't quite as non-Newtonian as a pure cornstarch ooblick, but has an appropriately slimy feel.
Some, however, insist that the notion of an ooblick *recipe* is far too mechanical, and that it is best to add the water in small increments so that the various mixed states the cornstarch goes through as it *becomes* ooblick can be grokked in fullness by many hands. For optional ingredients of this experience, see the "{Ceremonial Chemicals}" section of Appendix B.
:op: /op/ /n./ 1. In England and Ireland, common verbal abbreviation for `operator', as in system operator. Less common in the U.S., where {sysop} seems to be preferred. 2. [IRC] Someone who is endowed with privileges on {IRC}, not limited to a particular channel. These are generally people who are in charge of the IRC server at their particular site. Sometimes used interchangeably with {CHOP}. Compare {sysop}.
:open: /n./ Abbreviation for `open (or left) parenthesis' —- used when necessary to eliminate oral ambiguity. To read aloud the LISP form (DEFUN FOO (X) (PLUS X 1)) one might say: "Open defun foo, open eks close, open, plus eks one, close close."