The term 'unfamiliar person' can be summed up as a STRANGER. A STRANGER is someone who is not known or familiar to the person they are interacting with. They may be a complete unknown, or someone who is only vaguely familiar. Strangers can come from any background and can be of any age, gender, race, or nationality. They may be encountered in a variety of settings, such as on the street, in a store, or at a social gathering.