It isn't short for anything. Rex is the Latin word for King. It can also be a version of "Reginald" that was Rex Harrisons birth name.
Tiranasouras
Rex- she signed her name Elizabeth R. Rex was Latin for sovereign
two legs
Regina. a King would write R for Rex. (Regina is Latin for queen and rex is Latin for king)
It's Regina for Queen. When Prince Charles takes the throne it will still be "R" but it will then stand for Rex which is King.
Iesus Nazrenus Rex Iudaeorum - 'Jesus of Nazareth, the King of the Jews'
I am 99% certain that M and R are on the coins, because they are the initials of the Danish Queen, Dronning Margrethe Rex (rex means king in latin, I think)
Initials stand for Rex Imperator - i.e. King, and Emperor of India.
The dinosaur group known as theropods evolved to stand upright and run. This group includes famous examples such as Tyrannosaurus rex and Velociraptor.
H would have stood for Henry but R stood for Rex which is Latin for King.
The blue triceratops's name is "Trixie" and the green T-Rex's name is "Rex"
chris young and its racks not rex