IPA: /ˈsʌbkoʊd/
KK: /sʌbkoʊd/
A specific type of data channel added to a compact disk or similar medium, used for organizing and locating information.
The subcode on the CD helps the player find the right track quickly.
Subcode → It is formed from "sub-" (meaning under or below) and "code" (from Latin "codex", meaning a book or system of laws). The word "subcode" refers to a code that is under or part of a larger system of codes.
Think of something that is 'under' ('sub-') a main system of rules or laws ('code') — that's what subcode means.