# Pi orbital

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Pi orbital | |||||||||||

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Pattern type | Oscillator | ||||||||||
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Number of cells | 305 | ||||||||||

Bounding box | 59×59 | ||||||||||

Period | 168 | ||||||||||

Mod | 42 | ||||||||||

Heat | 270.7 | ||||||||||

Volatility | 0.91 | ||||||||||

Strict volatility | 0.61 | ||||||||||

Discovered by | Noam Elkies | ||||||||||

Year of discovery | 1995 | ||||||||||

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**Pi orbital** is a period-168 oscillator that was found by Noam Elkies in August 1995. It works by using four crowns and four blocks to turn a pi heptomino ninety degrees every 42 generations. A second pi heptomino can be inserted to reduce the period to 84. On March 26, 2009 Nicolay Beluchenko found a relatively small period 12 sparker that could replace the crowns. On April 6, 2010 Matthias Merzenich discovered the Blocked p4-4 period 4 oscillator that also supports the oscillator.

## Image gallery

## See also

## External links

- Pi orbital at the Life Lexicon

- Pi orbital at Adam P. Goucher's Catagolue (extended)

Categories:

- Patterns
- Oscillators with 305 cells
- Patterns with 305 cells
- Patterns found by Noam Elkies
- Patterns found in 1995
- Outer-totalistically endemic patterns
- Oscillators
- Periodic objects with minimum population 305
- Oscillators with period 168
- Oscillators with mod 42
- Oscillators with heat 270
- Oscillators with volatility 0.91
- Oscillators with strict volatility 0.61
- Non-flipping oscillators that turn 90 degrees