Crescent
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A crescent shape is a symbol or emblem used to represent the lunar phase in the first quarter, or by extension a symbol representing the Moon itself.
A waxing crescent Moon (23% lit) appears reddish low in the western sky, as seen from Berlin in October 2018, after astronomical dusk (and minutes until moonset).
Crescent depicted in the shape of a lighted sign
Hierosgamos of Sun and Moon in a 16th-century alchemical manuscript
Sumerian cylinder seal, dated c. 2400 BC, showing the Moon god as a crescent symbol
Emblem
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An emblem is an abstract or representational pictorial image that represents a concept, like a moral truth, or an allegory, or a person, like a monarch or saint.
The Wilton Diptych (c. 1395–1399) features angels wearing White Hart (a deer), the personal emblem of King Richard II of England.
House of the Prince of Naples in Pompeii Triclinium Emblem on North Wall
"The big eat the small", a political emblem from an emblem book, 1617