None. But Ag - with the g in lower case - is silver.
Ag is the symbol for the element silver.
The element with the chemical symbol Ag is silver.
Ag is the chemical symbol for silver, which is an element. It is not a compound.
The symbol for the element silver is Ag.
Silver
Silver is a metalic chemical element.
The chemical symbol of silver is Ag.
The chemical symbol for silver is Ag.
Only one element has the atomic symbol Ag, and that is silver. Each element in the periodic table has its own, unique atomic symbol. However, if your question is asking whether another elements name simply consists of the letters 'ag' then that would be magnesium.
silver
Ag
Silver, whose symbol is Ag, is an element.