The sign means a reference to another party in that scheme.

What the sign meant was not clear, but the men were frightened.

Sometimes a person may not know what a sign means.

The negative sign means that work is done on the gas by the surroundings.

But here the sign meant another hour of beautiful scenery.

Having these signs doesn't always mean a person is using drugs.

The sign means that the rate is expressed per thousand.

Largely because this is one time the signs don't mean what they seem.

Of course, a sign doesn't mean anything unless you know how to interpret it.

That sign meant I was on the run from the police and would rather be alone.