\sqcup

latex square u. the symbol for least upper bound.
(1994-12-01)

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\subseteq
like a u on its right side with a line under it. for sets x and y, x \subseteq y if all elements of x are also elements of y. (1995-02-03)
\uparrow
character an upward pointing arrow in latex. see closure. (1995-03-16)
`arafat
[ahr-uh-fat, ar-uh-fat] /ˌɑr əˈfæt, ˈær əˌfæt/ noun a hill 15 miles (24 km) southeast of mecca, in saudi arabia: site of muslim pilgrimages.