Tie signs are signs, signals, and symbols, that are revealed through people's actions as well as objects such as engagement rings, wedding bands, and photographs of a personal nature that suggest a relationship exists between two people. For romantic couples, public displays of affection (PDA) including things like holding hands, an arm around a partner's shoulders or waist, extended periods of physical contact, greater-than-normal levels of physical proximity, grooming one's partner, and “sweet talk” are all examples of common tie signs. Tie signs inform the participants, as well as outsiders, about the nature of a relationship, its condition, and even what stage a relationship is in.