Long, bright dash with half-circle underneath: You are slightly hidden from view animals will have an easier time spotting you than the previous two levels, but for medium-range hunting this level of visibility is not a liability. Long, bright dash: You are very well hidden from view animals can see you from a further distance than the short, dim dash, but they will be hard-pressed to see you. Short, dim dash: You are almost entirely hidden from view animals can still see you if they get close enough. Things like running, moving around in an upright position, being under cover and being in their line of sight all affect it the following symbols are used, from least visible to most: The icon between your heart rate monitor and noise level indicators is how visible you are to animals.
Shamelessly copy-pasted from a reply I made to an earlier post asking about this topic: