This sign is all three types of signs: a symbol, an index, and an icon. The element of the sign that is a symbol is the red circle with a red line across it, which means “no” or “prohibited.” That the circle, being red and dashed, carries these meanings is determined socially and by convention, and in that it is arbitrary, thus fitting the definition of a symbol. The indexical element of the sign is that its meaning is meant to be applied both to the space surrounding the sign and those members of society represented in the iconic element of the sign. The iconic element of the sign is those human figures depicted within the dashed circle, as they are pictorial representations of their social equivalents in flesh and blood.
As was hinted at in the discussion of the first sign, this sign (the third) deliberately picks out the youth members of society. Although it says nothing regarding loitering, that its meaning implies prohibition allows for the interpretation that youth is not allowed to linger in the area upon which the sign is acting. The behavior then that this sign may be attempting to control is the assumed reckless behavior of the youngest members of society, and more specifically, teenagers, as is suggested by the cap the middle figure is sporting, and even the poses of all the figures. More indirectly, it may also be a message to the parents of the youngest members of society, something along the lines of “Keep your children on a leash,” that is to say, ensure that children are in proper, accepted areas, probably those that have some degree of surveillance, either by the parents, society, or the state.
As a side note, I believe this sign is very much alienating youth, and that the consequences of this can be seen all across America in shopping malls, high-schools, and even at home, among many others.
