在字符编码术语中，码位或称编码位置，即英文的code point或code position，是组成码空间（或代码页）的数值。 例如，ASCII码包含128个码位，范围是0_16进制到7F_16进制，扩展ASCII码包含256个码位，范围是0_16进制到FF_16进制，而Unicode包含1,114,112个码位，范围是0_16进制到10FFFF_16进制。Unicode码空间划分为17个Unicode字符平面（基本多文种平面，16个辅助平面），每个平面有65,536（= 2）个码位。因此Unicode码空间总计是17 × 65,536 = 1,114,112.

In character encoding terminology, a code point or code position is any of the numerical values that make up the code space. Many code points represent single characters but they can also have other meanings, such as for formatting.

For example, the character encoding scheme ASCII comprises 128 code points in the range 0_hex to 7F_hex, Extended ASCII comprises 256 code points in the range 0_hex to FF_hex, and Unicode comprises 1,114,112 code points in the range 0_hex to 10FFFF_hex. The Unicode code space is divided into seventeen planes (the basic multilingual plane, and 16 supplementary planes), each with 65,536 (= 2) code points. Thus the total size of the Unicode code space is 17 × 65,536 = 1,114,112.