You can extend the idea of isograms to sentences that don't repeat any letters. Interestingly, there are several English sentences that use each letter exactly once. They're all pretty weird and either borrow from other languages or use acronyms that were later accepted as English words. For example: Veldt jynx grimps waqf zho buck As I'm typing this, my word processor is marking each of the above words (save for “buck”) as spelled incorrectly, though I promise they're real words. Honest.
Source: wiktionary