How many angels can dance on the head of a pin?

The question "How many angels can dance on the head of a pin?" has been used many times as a dismissal of medieval angelology in particular, and of scholasticism in general. The phrase has been used also to criticize figures such as Duns Scotus and Thomas Aquinas, who explored the intersection between the philosophical aspects of space and the qualities attributed to angels. Another variety of the question is: "How many angels can stand on the point of a pin?"