In typography, the tombstone symbol ∎ is sometimes used to mark the end of a mathematical proof. It is also called a halmos, after its eponymPaul Halmos.
Example Usage of (typography)
WayneTTurner: RT @Burke: What's with all these Wordpress themes waxing poetic on love of typography, but only using various sizes of Georgia? #wordpress
LSDpress: RT @creativelydone: This is a great idea for some variation in web typography: The Next Serif Trend http://ow.ly/NHbu
mary_stiffler: The Secret Conversations of Cookies - A tasty typography adventure - http://bit.ly/p2JBG
