Does anybody know what "Rex" means in the names of different knife steels?

[DanialK]

Hello, forgive me if this isn't the correct category, I'm still very new to this forum!

I've been reading about all the different steels used to make knives I don't know how people keep them straight haha. It seems like there's often some kind of meaning when choosing the name of a newly developed composition, like the "S" for stainless in S30V or the "N" for nitrogen in BD1N. Is there any significance to the prefix "Rex" in Rex 45 or Rex 76, for example? Google hasn't been very helpful so if anybody could explain the meaning of Rex, assuming one exists, I appreciate it!
Thank you!

 

[knarfeng]

I only see it used for alloys made by Crucible Steel. I suspect its part of their naming system. Best guess.

According to this page they use it as part of their nomenclature for "super high speed steels" made by their CPM process.

Crucible Tool Steel and Specialty Alloy General Information

 

[Planterz]

It means "king" in Latin. If that's what they intended to imply, I don't know.

 

[Larrin]

Rex is Crucible branding for high speed steel. Their original high speed steels were Rex A and Rex AA around 1900-1905. They have added Rex branding to the beginning of all of their high speed steels, even standard grades like Rex M4, Rex T15, CPM Rex M4, in addition to their own original steels like Rex 86, Rex 121, etc.