All domain names have potential. Any domain can, at some point, mean something to someone. And that someone may be willing to pay lots of money for it.
A good example are brand names: everyday new businesses are formed and brands created. So a good sounding domain with no meaning may become a brand in the eyes of the marketer of a big company.
In a similar fashion, any short combination of letters may prove popular as an acronym. For instance the domain GRFT.com does not sound really exciting, until you realize that it stands for Grand Rapids Foam Technologies (before you rush to register it, let me point it it is already registered).
If you know a foreign or even extinct language, keep in mind that some modern brands were create from them. For instance Ubuntu (the popular Linux version) was named after a word of the African Bantu language.
If you happen to own strange domains, if you want to make money, you need to discover what their true meaning is.