code point; character position
Technical computing term referring to the numerical position of a character in a coded character set, such as Unicode.
In Unicode, each character is assigned a code point.
文字コード (character code) is a broader term for the encoding system, while 符号位置 specifically refers to the numeric position within that system.
Compound of 符号 (code, sign) and 位置 (position). A straightforward technical term.