1-2-3

1-2-3 was found by David Buckingham in August 1972.[1] This is one of only three essentially different period-3 oscillators with only three cells in the rotor. The others are stillater and cuphook.

1-2-3
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Pattern type Oscillator
Oscillator type Billiard table
Number of cells 26
Bounding box 10×9
Period 3
Mod 3
Heat 2
Volatility 0.11
Strict volatility 0.11
Rotor type 1-2-3
Discovered by David Buckingham
Year of discovery 1972

A 69-glider synthesis is known for a stator variant of this oscillator and was discovered by Martin Grant.

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
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