Pi-heptomino (or pi; sometimes called blasting cap at MIT after its shape at generation 1) is a common heptomino that stabilizes at generation 173, leaving behind six blocks, five blinkers and two ponds. The name "pi" is also applied to some slight variations of this object that follow that same evolutionary sequence – in a pi ship, for example, the pi-heptomino itself never actually arises. Forms that are synonymous with the pi-heptomino are displayed below.
It is the most common methuselah to occur naturally in a specific orientation; while less common than the R-pentomino, the R-pentomino has eight orientations, while the pi-heptomino only has four, and more common sequences like the traffic light and honey farm are not methuselahs.
Common formations equivalent to the pi-heptomino. Patterns in the same row are in the same generation. To follow an evolutionary sequence, start from the bottom and move up; if there is nothing above a pattern, its evolutionary sequence converges with the closest column inward that has a pattern until they all reach the top. (click above to open LifeViewer) RLE:herePlaintext:here