What Does Hardcode Mean?

A hardcode is a part of a computer program which cannot be altered in any way except by changing the source code of the program itself.

Techopedia Explains Hardcode

Only certain portions of a program can be hardcoded and the most basic examples are constant values, especially those used in the sciences like physics and chemistry, as well as math in general. A hardcode has one purpose, and that is to ensure that the value being hardcoded cannot be changed during run time of a program.