What is the name for a hardcoded value entered into a formula?

The answer is Constant. In a formula these are values which are not changed. It is usually a value derived and is plug in as a factor in the equation. In a spreadsheet a cell can be hard coded when reference into a formula using the '$' sign which precedes the referenced cell.

The constant is used for a hard coded value entered into formula

hasConstants () used this formula for hard coded value