Salvo

A salvo is a collection of spaceships (usually gliders) that are all coming from the same direction. A slow salvo is a salvo in which the spaceships are far enough apart that any reaction affecting the n^th spaceship has settled down by the time the (n+1)^st spaceship arrives. A P1 slow salvo is a slow salvo in which the intermediate settled-down stages are all period 1 (i.e., stable.)