Q: What does the number above the symbol represented?

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An unknown number represented by a letter or symbol is a variable.

The set of rational numbers is represented by Q.

A power or exponent.

There is no symbol in Roman numerals to represent zero.

The Roman numeral 4 is represented by the symbol 'IV'.

Related questions

An unknown number represented by a letter or symbol is a variable.

Conventionally in chemistry, the atomic number is represented by the symbol 'Z'.

N the symbol = N

the number above the symbol is the atomic....... of that element.

Titanium, atomic number 22 with an Atomic Mass of 47.867 amu, is represented with the symbol Ti.

Their symbol, atomic weight, and atomic number.

The set of rational numbers is represented by Q.

There is no symbol above the number 0 on my phone keyboards. So clearly, it is not a standard.

Atomic mass and Atomic number

It is not, The mass number is (A). The symbol for atomic mass is (ma)

the chemical element with atomic number 2, and is represented by the symbol He

A power or exponent.