its just a common unknown. here is a list of different physics notations
http://en.wikipedia.org/wiki/List_of_common_physics_notations
The chemical symbol of actinium is Ac.
Uranium
The chemical symbol of nickel is Ni.The chemical symbol of silver is Ag.
The symbol U in chemistry stands for uranium. Uranium has 92 protons, making it the element with 92 on the periodic table.
It's the chemical symbol for Oxygen. Is that what you meant?
The chemistry symbol for hydrochloric acid is HCl.
In chemistry, the symbol "" signifies a positive charge on an ion or a molecule.
In chemistry, its symbol is, "Ni"
Pb is the international chemical symbol for Lead
The chemical symbol of actinium is Ac.
A symbol
Uranium
Na is the chemical symbol of sodium.
Compounds containing the "m" symbol in chemistry typically have a metallic character, meaning they tend to conduct electricity, have a shiny appearance, and can form positive ions. These compounds often have high melting and boiling points, are malleable, and can form alloys with other metals.
Sulfur
francium
The symbol of heat is Q.