ROTRUY is a codename.
It is the best codename.
It consists out of 2 parts: Ro and Truy, both stand for a part of the maker's name.
Ro is a part of his first name and Truy is a part of his last name.
No one knows his full name, he is often deemed legendary and this codename strikes all with fear.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).