The prime-mark is the [[Hebrew]] ''gerash'', called '''κεραια''' or ''keraia'' in Greek; this was called a "tittle" in Elizabethan [[English]]. The ''gerash'', or the double-prime called ''gershayim'' (dual number), appeared often in Hebrew manuscripts to distinguish numbers (written with ordinary alphabetic letters) from regular text. | The prime-mark is the [[Hebrew]] ''gerash'', called '''κεραια''' or ''keraia'' in Greek; this was called a "tittle" in Elizabethan [[English]]. The ''gerash'', or the double-prime called ''gershayim'' (dual number), appeared often in Hebrew manuscripts to distinguish numbers (written with ordinary alphabetic letters) from regular text. |