V spark
A V spark is a common three-bit polyplet spark, produced most notably by the pentadecathlon, twin bees shuttle, and the phi spark (e.g., in Tanner's p46). The spark can convert a pre-block or block into a glider as shown at right.
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obo$bo!
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bo$2o2bo$3bo$4bo!
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It can also turn a glider into a block, so 2 V sparks can make a reflector.
Also see
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