Meaning of this symbol What is the mathematical meaning of a horizontal A. I mean that it is like this > but crossed which makes it look like a horizontal A.
Usually, a slash on symbols in mathematics indicates a negation of the original meaning of the symbol. 

For example, \begin{align}=\quad&amp;\to\quad\ne\quad(\text{equality})\\\mid\quad&amp;\to\quad\nmid\quad(\text{divisibility})\\\in\quad&amp;\to\quad\notin\quad(\text{element})\\&gt;\quad&amp;\to\quad\ngtr\quad(\text{greater than})\\&lt;\quad&amp;\to\quad\not\lt\quad(\text{less than})\\\sim\quad&amp;\to\quad\nsim\quad(\text{distribution})\end{align}
"≥" This means "equal or greater than"
">" This means "greater than" (being equal is not included)
"≯" This means "no greater than" &lt;= What the hey is the difference between this brat and "≤"???