its just a common unknown. here is a list of different physics notations
http://en.wikipedia.org/wiki/List_of_common_physics_notations
It doesn't have any specific universal meaning.
It could mean any number of things depending on the context.
A chemical symbol is the representative for a chemical element; for example B is the symbol of boron.
The symbol used in chemistry identifies the chemical element. For example, you have :
O -----> oxygen
H------> Hydrogen
Ni-----> Nickel
You spilled soda on your keyboard.
it has a specific meaning of course it does u idiot O_o
The chemical symbol of actinium is Ac.
Uranium
Potassium
The chemical symbol of nickel is Ni.The chemical symbol of silver is Ag.
Conventionally in chemistry, the atomic number is represented by the symbol 'Z'.
Pb is the international chemical symbol for Lead
In chemistry, its symbol is, "Ni"
The chemical symbol of actinium is Ac.
A symbol
Uranium
Na is the chemical symbol of sodium.
The symbol for Hydrochloric acid is HCl.
Dalton's symbols are not used in chemistry because it is very difficult to represent in chemistry
Mr is the symbol for the relative molecular mass.
Sulfur
francium
Potassium