A pufferfish spaceship is, generally, any spaceship constructed using pufferfish. The term may refer specifically to the extensible c/2 period-36 spaceship constructed by Ivan Fomichev in December 2014, the first such spaceship to contain no period-2 or period-4 parts. (The first two or three rows might be considered to be period 2 or 4, but they are directly dependent on following rows for support.).
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- Pufferfish spaceship at the Life Lexicon