The word binary has as its root the word bi which means '2'. Some other words which use the root bi are bicycle (two wheels), biannually (every two years), and bilateral (two sided).
A binary set is a set that contains exactly two members. One example of a binary set is the set of truth values: { true, false }. Another example of a binary set is the digits for binary numbers (base 2 numbers): {0, 1}.^{[1]}

A binary operator is an operator that takes two operands as arguments. Table 1 contains examples of binary operators. 
#  A  B  C  D 
E  F  G  H  I 
J  K  L  M  N 
O  P  Q  R  S 
T  U  V  W  Y 
Z  X 
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