Another Friday Filler
Just ran across this bit this morning. Thought it would make a good trivia question.
??? is the plotted amount of light from the sky that will be available in a building once an adjacent building has been erected. In building construction in certain countries, a builder may need to recognize the legal "rights to light" of nearby building owners. Accordingly, formulas have been created for calculating ??? and these can be computerized.
What is the ??? called? Googlers please hold off for a while.