I've been having trouble tracking down all the information on this, the old fashioned practice where a woman would give a handkerchief to a man (usually a soldier) who would wear it as a memento when going into battle. That's rather vague but it's really all I've been able to find on it. What I'm looking for ideally is what it's called, what it symbolises, if there were other occasions it was practiced (i.e. when the man was not going to battle) and what time periods it was common. Any help would be fantastic, google has let me down for once.