Any wind towards an athlete's front, either directly or in a slanting direction, is considered a headwind. Headwinds are measured with a minus sign (-) — ie. -2.0.

TAMPA, Fla. — A weather vane is an instrument used to show the direction the wind is blowing from. It is one of the simplest weather instruments created and it has been used since ancient times ...

But hey, that’s not a satisfying answer, and I know you didn’t ask just to hear that.So, I did a little digging to find out when and why wind direction got defined by where it’s coming from ...