Hexadecimal
(original named Sexadecimal)
The base 16 notational system for representing real numbers.
The digits used to represent numbers using hexadecimal notation are
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F.
The following table gives the hexadecimal equivalents for decimal numbers
from 0 to 15
Hex

Bin

Dec

0

0000

0

1

0001

1

2

0010

2

3

0011 
3

4

0100

4

5

0101

5

6

0110

6

7

0111

7

8

1000

8

9

1001

9

A

1010

10

B

1011

11

C

1100

12

D

1101

13

E

1110

14

F

1111

15

The hexadecimal system is particularly important in computer programming,
since four bits (each consisting of a one or zero)
can be succinctly expressed using a single hexadecimal digit.
Two hexadecimal digits represent numbers from 0 to 255, a common range
used, for example, to specify colors.
Thus, in the HTML language of the web, colors are specified using three
pairs of hexadecimal digits RRGGBB,
where is the amount of red, the amount of green, and the amount of blue.
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