The VARBIT data type is used for storing bit arrays that are under 32767 bits in length.
VARBIT [ (max-length ) ]
max-length The maximum length of the bit array, in bits. The length must be in the range 1 to 32767. If the length is not specified, then it is 1.
VARBIT can also be specified as BIT VARYING. Regardless of which syntax is used, the data type is described as VARBIT.
SQL/2003 Vendor extension.