What were the three crowns of ancient Egypt?
Pharaohs in ancient Egypt had many crowns, but there are four
most prominent ones: the red crown of Lower Egypt (called the
d.sh.r.t), the white crown of Upper Egypt (called the h.dj.t), and
the blue ceremonial crown (called the kh.pr.sh). Red and white
eventually became a double crown symbolizing the united kingdoms of
Lower and Upper Egypt, and it became known as the s.kh.mt. or in
Greek the pschent. During military campaigns, especially battles,
pharaoh wore the blue crown, but it was also used on special days
unrelated to war.
It's important to note that vowels aren't preserved in
hieroglyphic writing, so today nobody knows how these words were
pronounced. It's customary to insert 'e' for all missing vowels
except where a 'y' might be more appropriate at the end of a word,
so the names of the crowns would become Deshret, Hedjet, Khepresh,
and Sekhemty.