"Nothing! These three are the only words of their type, and no further terms in the series have ever existed." Oxford dictionary. But you can use tuples, Names for tuples of specific lengths: 1 single. 2 double. 3 triple/treble. 4 quadruple. 5 quintuple pentadruple. 6 sextuple hexatruple. 7 septuple. 8 octuple. 9 nonuple. 10 decuple. 11 ... More @Wikipedia
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