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when a symbol such as <or> is placed between two expressions
WordPad is not meant to handle the typesetting and display of mathematical expressions. You can use this radical symbol: √ to display simple square roots, but you can't extend the mark above the thing you're taking the square root of. To display more complex expressions, you need a program like MathType, which is specifically designed to typeset math.
< this symbol can also mean less than
That's called an "operator", for example, the plus sign in 3 + 4. The numbers are the "operands" - that is, the numbers (or expressions) operated upon. More precisely, a binary operator, since it works with two operands. In theory, an operand is just a special way of writing a function, since a third number is calculated, according to certain rules, from the other two.
There is no specific symbol. The symbol for real numbers is R and that for rational numbers is Q so you could use R \ Q.