a hyphen connects two words, a dash gives a pause between two words....
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It is a hyphen used for the separation of words. It is a single short line set half-way between the bottom and top of typed or written letters. It can be used in compound words. Hyphen is also called a dash.
It depends upon what kind of a dash one has in mind. A hyphen is sometimes called a dash and it looks like this: - , but a dash can also mean a small amount of a powder or particles (like a dash of pepper or salt), and a dash can mean a short run, like making a dash to catch the bus.
Ideally, yes
Because the difference between 100,000,000 and -100,000,000 is greater than a hyphen. Mathematical sentences without symbols would be as nonsensical as regular sentences without verbs: they tell you what to do.
A hyphen.