A proper identification of the Johannine signs significantly sharpens one's grasp of John's Christology. While there is substantial agreement regarding six signs, no consensus has yet been achieved regarding possible further signs in John. After an exploration of the "signs" concept in the OT, three criteria for Johannine signs are established, resulting in a working definition. These preliminary considerations then function as parameters in the search for potential additional signs in the Fourth Gospel. The essay concludes with a brief discussion of the implications of the study's findings for the structure of John's Gospel.