A pipsquirter (or simply squirter) is an oscillator that produces a domino spark that is orientated parallel to the direction from which it is produced (in contrast to domino sparkers like the pentadecathlon and heavyweight spaceship, which produce domino sparks perpendicular to the direction of production). Most of the useful pipquirters have been found by Noam Elkies, including pipsquirter 1 and pipsquirter 2, which have periods 6 and 7, respectively.
- "Squirter". The Life Lexicon. Stephen Silver. Retrieved on May 23, 2009.