Research into masoretic biblical manuscripts (MSS) is heavily reliant on our ability to reunite fragments once belonging to the same codex, now separated one from the other in the Genizah morass, and to identify the scribes behind codices whose colophons have been lost. This task is made especially difficult by the fact that the oriental square hand in which these codices were written is highly stereotypical. Consequently, the paleographer must rely on paratextual features: non-textual features that accompany the biblical text itself, which form a kind of fingerprint for each MS or scribe. This article argues that the masora circule (the small circule used in these MSS to link the masoretic notes to the biblical text itself) functions as part of this unique fingerprint.