A bumper is any one of several periodic color-preserving glider reflectors, most of which were discovered by Tanner Jacobi on 6 April 2016. See p3 bumper, p4 bumper, p5 bumper, p6 bumper, p7 bumper, p8 bumper, p9 bumper, p11 bumper, and p15 bumper.
At gen 11 or 12, a spark is needed. A dot spark can be used on gen 11 (such as from the blocker). The spark from the grin (such as from the Coe's p8) at gen 12 can also work; at gen 20, a glider an R-pentomino is produced. The glider escapes, and the R is converted back to a loaf using an eater 1
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- Bumper at the Life Lexicon