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The "end of proof" symbol or "halmos" is used by mathmeticians to mark the end of a mathematical proof. It appears as a solid (or sometimes open) box.

The halmos is called a "tombstone" by magazine writers who use it to mark the ends of magazine articles. It had been used by magazine editors and writers before it was adopted by mathmeticians.

See: http://home.att.net/~numericana/answer/symbol.htm#halmos

Unfortunately, it does not appear on the standard keyboard but is a part of the unicode and other character sets. It is often available (within some software programs) by typing special character sequences. Some writers have used // or [] as an attempt to replicate the box using only the standard keyboard characters.

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