Annulet (heraldry)

In heraldry, an annulet (i.e. "little ring") is a common charge,[1] which can be described as a roundel that has been "voided" (i.e. with its centre cut out).

[2] In the 19th century, it was theorised by Webster's Dictionary to be related to the custom of prelates to receive their investiture per baculum et annulum ('by rod and ring').

[3] In English and Canadian heraldry it is also used as the difference mark of a fifth son.

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Annulets as regular charges (not as a difference). Gules, three annulets in pile Argent