Datum

The singular form of data
For example, one datum
It is rarely used, and data, its plural form, is commonly used for both singular and plural

A Bit

The computer (or an Intel computer, or a computer that runs on an Intel microprocessor)  

(B-1) Uses the binary system to represent its information

Example of (B-1)

A piece of information in the computer is called a datum
(B-2) The plural is data

Example of (B-2)

Sometimes, the word data is used for both singular and plural

The computer represents data

Using [...]