There's no such thing.
I is the chemical symbol for iodine.
I is the chemical symbol for iodine.
I is the chemical symbol for iodine.
Hydrogen
nitrogen
K is the chemical symbol of potassium.
Be is the chemical symbol for beryllium.
Iodine
As is the chemical symbol of arsenic.
zinc oxide
AgBr is the chemical formula (not symbol) of silver bromide.
O is the chemical symbol for oxygen.