It's up upside down 9... numbers rock!
The number above an element's symbol in the periodic table represents its atomic number, which indicates the number of protons in the nucleus of an atom of that element. Atomic number determines the element's unique identity and its placement in the periodic table.
The atomic number.
There is no symbol above the number 0 on my phone keyboards. So clearly, it is not a standard.
A power or exponent.
The symbol above two numbers is referred to as a caret. In mathematics, it represents exponentiation, meaning that the first number is raised to the power of the number below the caret.
@ It is the symbol above the number 2 on the QWERTY keyboard.
A number with a line above it - 4
ampersand
atomic number
by subtracting the atomic number from the mass number. the atomic number is the one under the element's symbol and the mass number is the one above the element's symbol.
That is an asterisk.
It is the state of ionisation.