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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).
Réaumur is a temperature scale in which the freezing point of water is defined as 0 degrees Réaumur (0 ºRe) and the boiling point of water is defined as 80 degrees Réaumur (80 ºRe). It is not commonly used today but historically was used in some European countries.