Since we can probably agree that you're not indexing distances or other units of measurement (you can make a piece of string of length sprt(2) centimeters or ot

Since we can probably agree that you're not indexing distances or other units of measurement (you can make a piece of string of length sprt(2) centimeters or other irrational lengths!), let's skip the terminology argument. That wasn't my point. Is skipping the 13th floor a US thing? I don't recall ever seeing it in the UK or Germany.