zettabit

[Zipporah Schumaker]

a unit of information equal to 1000 exabits or 10^21 bits

[MiguelANymn]

The bit is the most basic unit of information in computing and digital communications. The name is a portmanteau of binary digit. The bit represents a logical state with one of two possible values. These values are most commonly represented as either 1 or 0, but other representations such as true/false, yes/no, on/off, or /− are also commonly used.
The relation between these values and the physical states of the underlying storage or device is a matter of convention, and different assignments may be used even within the same device or program. It may be physically implemented with a two-state device.
A contiguous group of binary digits is commonly called a bit string, a bit vector, or a single-dimensional (or multi-dimensional) bit array.
A group of eight bits is called one byte, but historically the size of the byte is not strictly defined. Frequently, half, full, double and quadruple words consist of a number of bytes which is a low power of two. A string of four bits is a nibble.
In information theory, one bit is the information entropy of a random binary variable that is 0 or 1 with equal probability, or the information that is gained when the value of such a variable becomes known. As a unit of information, the bit is also known as a shannon, named after Claude E. Shannon.
The symbol for the binary digit is either bit as per the IEC 80000-13:2008 standard, or the lowercase character b, as per the IEEE 1541-2002 standard. Use of the latter may create confusion with the capital B which is used for the byte.

[Kit]

A zettabit is a unit of digital information storage used to denote the size of data. It is equivalent to 1 sextillion (10 to the 21st power) bits or 1,000 exabits. It is commonly used in the field of data processing and storage, data transmission, etc.