256 (two hundred [and] fifty-six, CCLVI) is the natural number following 255 and preceding 257.
In mathematics, 256 is a composite number, with the factorization 256 = 28, which makes it a power of two.
It is also equal to:
* 16², the square of 16
* 44
* 4↑↑2 using Knuth's up-arrow notation
Two hundred fifty-six is also:
* The number of characters in the new Braille 8-dot system.
* The number of different values in one byte, which makes it the typical number of different values in each color channel of a digital color image (see color space encoding).
* The number of columns in a standard Microsoft Excel worksheet.
* The year AD 256 and 256 BC.
* The Split-Screen Level in Pacman
* The number of counties in Texas.
* The number of characters in Mikhail Bulgakov's novel The Master and Margarita.
* An area code in Alabama.
* The number of regular season football games in the NFL.
* The frequency of Middle C in hertz under philosophical pitch.
* The number of the Amarna letter (EA256), which, according to David Rohl, was written by Ishbosheth and contains mentions of King David, Jesse, and Joab.