The text of the Pericope Adulterae is marked by an obelus. The Pericope Adulterae (John 7&colon;53-8&colon;11) is marked by an obelus. It contains the Pericope Adulterae (John 7&colon;53-8&colon;11), but it was marked with an obelus. The obelus was also occasionally used as a mathematical symbol for subtraction. The Pericope Adulterae ("John" 7&colon;53-8&colon;11) is marked with an obelus. The texts of , John 5&colon;4, and John 7&colon;53-8&colon;11 are marked by an obelus. The text of the Pericope Adulterae (John 7&colon;53-8&colon;11) is marked by an obelus. The obelus was introduced by Swiss mathematician Johann Rahn in 1659 in "Teutsche Algebra". In 2013 he released "Obelus", the debut album from his new side-project XYZZY.