Which name below is not usually another name for "nibble" in computing & networking?

Which name below is not usually another name for "nibble" in computing & networking?

• tetrad
• quartet
• quadbit
• quaddigit 

EXPLANATION

A "nibble" contains 4 digits, as opposed to a "bit" containing 1 digit or a "byte" containing 8 digits. All of the above except "quaddigit" references or are other names for nibble. The most
common reference to quad-digit in technology are 4 position timers, like an oven displaying the time or countdown timer.

SOURCE

https://en.wikipedia.org/wiki/Nibble