What is the term for the unique abbreviation given to each element?

The term for the unique abbreviation given to each element is the atomic symbol.
The atoms of all the elements are represented by a unique atomic symbol which is a one or two lettered notation used to represent an atom corresponding to an element. If the atomic symbol has two letters, the first letter is capitalized and the second is in lower case. For example hydrogen is represented by the letter H.

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i