The double signs, also called the double-bodied signs or the bicorporeal signs, are Gemini, Pisces, and Sagittarius. This expression comes from the symbols for these signs: twins for Gemini, two fish for Pisces, and a part human, part horse (centaur) for Sagittarius. Virgo is sometimes also included in this category, which would make all of the mutable signs double signs. Double signs, particularly Gemini and Pisces, are sometimes used to indicate “twos” in a chart interpretation. Thus, for example, someone with a double sign on the cusp (beginning) of her or his seventh house (the house of partnerships) might be told that she or he will have two marriages, or someone with a double sign on the cusp of the fifth house (which refers to children, among other things) might be told that she or he will have two children, with the possibility of twins.