It depends on the context.
Some possibilities:
In the UK it could refer to a motorway going from London to the South West.
Or it could refer to a measure of money supply in the economy - out of fashion in recent years.
If the 3 were a superscript, it would be a measure of volume.
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Do you mean as in m3 it means 'cubed'
there is no symbol for it.
If you mean the symbol &, it is called an ampersand.
r is the symbol for rate
pagen religion symbol