0 SINGLE DOUBLE TRIPLE THEN WHAT WOULD BE 4,5,6....

1 Single 2 Double 3 Triple 4 Quadruple 5 Quintuple/Pentuple 6 Sextuple/Hextuple 7 Septuple 8 Octuple 9 Nonuple 10 Decuple 11 Hendecuple/Undecuple 12 Duodecuple 13 Tredecuple 14 Quattuordecuple 15 Quindecuple 16 Sexdecuple 17 Septendecuple 18 Octodecuple 19 Novemdecuple 20 Viguple

The unique 0 tuple is called the null tuple. A 1 tuple is called a singleton, a 2 tuple is called a pair and a 3 tuple is a triple or triplet. The n can be any nonnegative integer. For example, a complex number can be represented as a 2 tuple, a quaternion can be represented as a 4 tuple, an octonion can be represented as an octuple, (many mathematicians write the abbreviation "8 tuple") and a sedenion can be represented as a 16 tuple.

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