IUPAC —> International Union of Pure and Applied

Chemistry approves name of elements.

Symbols are the first one or two letters of the element’s name in English. The first letter of a symbol is always written as a capital letter (upper case) and the second letter as a small letter (lower case).

e.g., Hydrogen —> H Helium —> He

Some symbols are taken from the names of elements in Latin, German or Greek.

e.g., Symbol of iron is Fe, its Latin name is Ferrum.

Symbol of sodium is Na, its Latin name is Natrium.