The less than operator is the < symbol.
No. Percent is not an operator, it is a symbol or cell format style.
yes
percent
percent
The ampersand, which is this character: &
The & is the concatenation operator. It could be used like this: =A1 & A2
For =A1+B1, the operator is the plus sign (+).
no
>= is a operator
No. It is a mathematical operator.
The minus sign.
In Excel, you use the asterisk, "*". As to the name, I would just call it the "multiplication sign".