Well, do you know why power buttons use a symbol that looks like a broken circle with a vertical line down the top? Here’s what the symbol means and where it came from. The power symbol ...

This is made of aluminium. Aluminium is an element. Now, each element has a chemical symbol made of one or two letters. Cal: Right, OK. And what is the chemical symbol for aluminium? Mrs Roberts ...

Sometimes it is easy to tell which element a symbol stands for. For example, C stands for carbon and Li stands for lithium. But sometimes the symbol comes from a name for the element that is not ...