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A crescent moon toggling a light-on-dark colour scheme.
A crescent moon marks the switch to a light-on-dark colour scheme, usually paired with a sun for the opposite. The association is with night rather than with anything about the display.
Switches the interface to a light-on-dark colour scheme, or indicates that one is in use.
Contexts: Software
A curved sliver formed where one circle overlaps another, tapering to points at both ends and thickest at its middle.
The astronomical crescent stands for the Moon itself; this one is a display setting that borrows the shape.
Several platforms use a crescent moon for do-not-disturb rather than for dark mode, so the same glyph does two jobs across systems.