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How to look up a symbol?

The instructor of a statistics and probability course 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?

## Best Answer

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`

.