The rivulets of wine that roll down the inside of the glass after a wine has been swirled are called legs in US and in Britain. The Spanish call them tears; the Germans, church windows.
Some wine drinkers look for great legs, falsely believing that nicely shaped legs (and who knows what that means?) portend great flavour.
In fact, legs are a complex phenomenon related to the rate at which liquids evaporate and the differences in surface tension between water and the wine’s alcohol content. Legs have nothing to do with greatness.
With wine, as with women, there is very little meaningful information one can deduce by looking at the legs.