What is the name for a sentence that contains all letters of alphabet?

There's no specific name for a sentence containing all letters of the alphabet. It's sometimes called a pangram or a holoalphabetic sentence.

Here's why:

* Pangram is a more general term for a sentence that uses all the letters of a given alphabet. While it's commonly associated with the sentence "The quick brown fox jumps over the lazy dog," it doesn't have to be that specific sentence.

* Holoalphabetic is a less common term, but it directly refers to a sentence containing all letters of the alphabet.

So, both terms are technically correct, but pangram is the more widely known and used term.