Diadem has a number of different meanings, including the following:
A diadem is a type of crown.
A diadem is also a shape of stone. This was shown on Nicolas Poussin's finger in his Self Portrait of 1650. It represents Constintina (strength of character).
Diadem is the brightest star in the constellation Coma Berenices.
A diadem may be one of several tropical butterflies in the genus Hypolimnas.
DIADEM The DIADEM software is a user interface for the DIPPR 801 database
DIAdem is a technical software for managing, analyzing, and reporting technical data from National Instruments
HMS Diadem was the lead ship of the Diadem-class of protected cruiser in the Royal Navy launched in 1896.
HMS Diadem was a cruiser of the Royal Navy in World War II.
Operation Diadem was a military operation in the Second World War's Italian Campaign.
Diadem is a series of books by John Peel
The Diadem Saga is a science fiction series by author Jo Clayton
"Diadems" is a song by American thrash metal band,