>How do you visually differentiate nulls from zeroes? My zero is a continuous line, starting top right and angling sharply left-down after a ~360° oval. That n

>How do you visually differentiate nulls from zeroes? My zero is a continuous line, starting top right and angling sharply left-down after a ~360° oval. That nicely makes it writable in one fluid motion. My null/empty set is a somewhat smaller circle and a separate slash starting and ending visibly outside the circle.