A Poster

1. A picture of a celebrity, an event etc., intended to be attached to a wall. Poster - Wikipedia
2. An advertisement to be posted on a pole, wall etc. to advertise something.
3. (Internet) One who posts a message.
4. (Australian rules football, informal) A shot that hits a goalpost, scoring one point.
5. (ice hockey, slang) A shot that hits a goalpost instead of passing into the goal