Mutual (for wedding)
Japanese : hiyoku renri
Translation : "Hiyoku" ( an imaginary pair of male and female birds with one eye and one wing that can only fly in tanderm) and renri. "renri"(it is a tree, but many roots of 2 different trees became united together.)
Brief explanation : "Hiyoku" and "renri" are symbols of a couple that completes each other.