Kleisma

The kleisma most commonly refers to:

• The interval 15625/15552;
• In the context of sagittal notation, a comma of about that size, specifically between half of the 200-comma ([317 -200⟩) and half of the Pythagorean comma ([-19 12⟩).
• The difference between a chroma and a diesis, as used in the extended meantone notation.