Reception refers to how each planet in a horary question chart "view" or "receive'" each other, either favourably, unfavourably, or somewhere in between. If Mars is in Taurus, and Venus is in Scorpio, then each of the planets is in the sign the other planet rules. (Venus is ruler of Taurus, Mars of Scorpio). This is called mutual reception by rulership, and although each planet is in its detriment, it nevertheless receives the other planet favourably. In some horary questions, a thorough understanding of receptions (and the above example skims the surface of this topic) is required to delineate the interplay of how the various significators view each other what sort of attitudes are taking place in the area of the question.