A **bit** (a contraction of **binary digit**) is the basic capacity of information in computing and telecommunications; a bit can have the value of either 1 or 0 (one or zero) only. These attributes may be implemented, in a variety of systems, by means of a two state device.

In computing, a bit can be defined as a variable or computed quantity that can have only two possible values. These two values are often interpreted as binary digits and are usually denoted by the numerical digits 0 and 1. The two values can also be interpreted as logical values (*true*/*false*, *yes*/*no*), algebraic signs (*+*/*−*), activation states (*on*/*off*), or any other two-valued attribute. The correspondence 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. The length of a binary number may be referred to as its "bit-length".

In information theory, one bit is typically defined as the uncertainty of a binary random variable that is 0 or 1 with equal probability, or the information that is gained when the value of such a variable becomes known.

In quantum computing, a *quantum bit* or *qubit* is a quantum system that can exist in superposition of two bit values, "true" and "false".

The symbol for bit, as a unit of information, is either simply "bit" (recommended by the ISO/IEC standard 80000-13 (2008)) or lowercase "b" (recommended by the IEEE 1541 Standard (2002)).

Read more about Bit: History, Representation, Information Capacity and Information Compression, Multiple Bits, Bit-based Computing, Other Information Units

### Other articles related to "bit, bits":

**Bit**- Other Information Units

... theory, include the natural digit also called a nat or nit and defined as log2 e (≈ 1.443)

**bits**, where e is the base of the natural logarithms and the dit, ban, or hartley, defined as log2 10 (≈ 3.322 ... Conversely, one

**bit**of information corresponds to about ln 2 (≈ 0.693) nats, or log10 2 (≈ 0.301) hartleys ... information unit equivalent to some fixed but unspecified number of

**bits**...

... The first technique used to ensure a minimum density of marks was zero code suppression a form of

**bit**stuffing, which set the least significant

**bit**of each 8-

**bit**byte transmitted to a 1 ... This

**bit**was already unavailable due to robbed-

**bit**signaling.) This avoided the need to modify the AMI code in any way, but limited available data ... with the G.703 and ISDN PRI standards which called for 64,000

**bits**per second, led to this system being superseded by B8ZS ...

**bit**Support

... Since version 11 of Adobe Flash Player, released October 4, 2011, 64-

**bit**and 32-

**bit**builds for Windows, Mac and Linux have been released in sync ... Previously, Adobe offered experimental 64-

**bit**builds of Flash Player for Linux, from November 11, 2008 to June 15, 2010 ...

... The UNIVAC 1105 had either 8,192 or 12,288 words of 36

**bit**magnetic core memory, in two or three banks of 4,096 words each ... Fixed-point numbers had a one-

**bit**sign and a 35-

**bit**value, with negative values represented in ones' complement format ... Floating-point numbers had a one-

**bit**sign, an eight-

**bit**characteristic, and a 27-

**bit**mantissa ...

... Extracting the original data from the received encoded

**bit**(from Manchester as per 802.3) original data XOR clock = Manchester value 0 ... Summary Each

**bit**is transmitted ... Manchester code always has a transition at the middle of each

**bit**period and may (depending on the information to be transmitted) have a transition at the start of the period also ... The direction of the mid-

**bit**transition indicates the data ...

### Famous quotes containing the word bit:

“I am perhaps being a *bit* facetious but if some of my good Baptist brethren in Georgia had done a little preaching from the pulpit against the K.K.K. in the ‘20s, I would have a little more genuine American respect for their Christianity!”

—Franklin D. Roosevelt (1882–1945)

“Writing a novel without being asked seems a *bit* like having a baby when you have nowhere to live.”

—Lucy Ellman (b. 1956)

“Scarlett O’Hara: Oh, oh, Rhett. For the first time I’m finding out what it is to be sorry for something I’ve done.

Rhett Butler: Dry your eyes. If you had it all to do over again, you’d do no differently. You’re like the thief who isn’t the least *bit* sorry he stole, but he’s terribly, terribly sorry he’s going to jail.”

—Sidney Howard (1891–1939)