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Delisle is a temperature scale in which the freezing point of water is defined as 150 degrees Delisle (150 ºD) and the boiling point of water is defined as 0 degrees Delisle (0 ºD). It is not widely used today, but historically it was used in Russia and some other countries.
The Leiden scale, denoted by ºL, is a historical temperature scale named after the Dutch city of Leiden. It was developed by Willem Jacob's Gravesande, a Dutch physicist, in the 18th century. In this scale, the freezing point of water is defined as 0 degrees Leiden (0 ºL), and the boiling point of water is defined as 150 degrees Leiden (150 ºL).