Which Zoomorphic sign was used both by Harappans and Rig vedic Aryans

Fish motifs appear prominently in both Harappan seals (often as religious symbols) and in Vedic traditions (though less emphasized than other animals). The fish symbol appears in Vedic literature and has continuity in later Hinduism as Matsya avatar. Bull was sacred to both cultures but was more prominent in Vedic worship.