This constant represents the width of an American Football Field.
Just select a choice of output units to see the width of the American Football field in your choice of units. This is also useful as an Constant-in-Equation (CiE) or Constant-in-Constant (CiC). Remember, you can just select and drag and drop a constant from the vCalc library when creating an equation or constant. Drag directly into the editor's left margin and when the check mark goes green, drop the CiE or CiC.