AKA: Decision Point
The Check is both a Trail Mark, as well as a Hash Concept. When used correctly, a Check adds difficulty to a trail without making it frustrating, as well as slow down FRB's and allow DFL's to catch up. This helps keep the pack together and arrive at the destination of the hare at more or less the same time.
Check Trail Mark
Each Kennel can have its own mark of a check. Some commonly seen marks are:

Check Point
A common mark and one easy to implement on pavement as well as cross country trails. If flour is placed in the middle, you can kick it to signify the direction someone is checking.

Check Crossing
Another common check mark, this takes a little more time to draw when using powdery substances such as flour or sawdust.

Check With ID
This mark contains letters or other identifying marks. This can be used to differentiate multiple hashing trails in a local area, the order the checks are to be completed, or whatever else the hare intends.

3 Dot Check
This check is a simple and effective mark for a Hare. It is easy to use for the hare as dropping three drops of flour or sawdust in a triangle is quick and efficient.
There are many more marks that can be used as checks depending on the kennel, the hare, or the conditions of the trail. Chalk Talk is always recommended for those not familiar with a particular HHH.
