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How to look up a symbol?

I am taking a statistics and probability course. The instructor uses an odd (to me) symbol for logical negation. The symbol is not a tide (~) or an exclamation mark (!) or the bar-over symbol. This symbol looks like the top right hand corner of a rectangle. What is this symbol called? I am trying to take notes using the Inftyeditor. Thanks John

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marked as duplicate by Werner, diabonas, lockstep, Count Zero, Caramdir Jul 23 '12 at 18:19

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Welcome to TeX.sx! Could you upload a sketch of this symbol to help us identify it, please? As new user without image posting privileges simply include the image as normal and remove the ! in front of it to turn it into a link. A moderator or another user with edit privileges can then reinsert the ! to turn it into an image again. –  diabonas Jul 23 '12 at 18:13
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Also, have you already tried Detexify? –  diabonas Jul 23 '12 at 18:14
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You're looking for $\neg$; for more symbols, see How to look up a symbol? –  Werner Jul 23 '12 at 18:14
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1 Answer 1

I have seen that symbol rather frequently and is a popular mathematical notation. AFAIK ~ and ! are more popular in computer science/engineering, because there is an actual symbol for that on the keyboard. :) The symbol is defined in math mode as \neg.

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As a character, it’s “¬” U+00AC NOT SIGN, and it’s the standard symbol for negation in logic and mathematics (most recently, as per the ISO 80000-2 standard, which does not even mention other notations for it). –  Jukka K. Korpela Jul 23 '12 at 18:22
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