Hash Signs

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Patches of white chalk mark the trail. If you see patches and you’re not on a false trail, shout "On-On". If you don’t see such marks for a long time, you may be on a false track.
Check mark (empty circle). Runners go in all directions and shout when they find chalk marks ("On One", "On Two", "On-On"). Unless you find three marks or another check mark you may be on a false trail! Designed to keep the pack together.
Titty Check (circle with boobs inside). Only female runners can check out the route. To give the girls a chance to find the trail.
Hold (circle with the letter H). Wait until all runners are present. Courtesy of the Hare, there may be drinks and watermelons. But at any indecent Hold, there should be beer.
Check back (two parallel lines across track). You are definitely on the wrong track. Overrides all other marks. Run back to the last check mark.
Splits (arrows pointing in different directions). Route splits, follow any. In this case the long is straight on; the short is to the right. The long is longer than the short.
On Home. This is a straight run to the end, probably less than 500 metres (Beware: Hares usually cannot judge distances). Follow the arrow and start thinking of beer.