A pangram is a text using every letter of the alphabet. Any book is likely to contain the entire alphabet, so a pangram needs to be small in order to be remarkable. Every text is either a pangram or a lipogram. An isogram is a text that does not repeat a letter. An isogrammatic pangram is a perfect pangram. My favorite isogrammatic pangram (by Clement Woods)—a grammatically complete sentence using every letter of the alphabet exactly and only once is - Mr. Jock, TV quiz Ph.D., bags few lynx.