A diadem (from Greek 'diadema, diadeo', to surround) was originally a white ribbon, ending in a knot and two stripes that were placed often on the shoulders, that surrounded the head of the king to denote his authority.
By extension, this term was applied later to a crown, generally with a circular shape. For example, the crown worn by a Pagan drihten (Anglo-Saxon king) was a diadem, as was the crown of a baron later (in some countries surmounted by three globes).
A diadem is also a jewelled ornament worn by women with the shape of a half crown, placed over the forehead (in this sense, also called tiara). In some societies it is also a wreath worn around the head.
That emblem was the diadem, and al though the diadem and crown are frequently confused with each other they were quite distinct, and it is well to bear this in mind.
The diadem, which was of eastern origin, was a fillet or band of linen or silk, richly embroidered, and was worn tied round the forehead.
The kings of arms in England, Scotland and Ireland wear crowns, the ornamentation of which round the upper rim of the circlet is composed of a row of acanthus or oak leaves.
DIAdem by National Instruments is a software for managing, analyzing, and reporting data collected during data acquisition and/or generated during simulations.
Diadem is the brightest star in the constellation Coma Berenices.
A diadem may be one of several tropical butterflies in the genus Hypolimnas.
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