3 verses have
sign
in Edition Clear Qur'an by Talal Itani / Maryam (Mary)

19:10He said, “My Lord, give me a sign.” He said, “Your sign is that you will not speak to the people for three nights straight.”

19:11And he came out to his people, from the sanctuary, and signaled to them to praise morning and evening.

19:21He said, “Thus said your Lord, `It is easy for Me, and We will make him a sign for humanity, and a mercy from Us. It is a matter already decided.'“