Wording.

Greeking

Standing in for real text with placeholder content — nonsense words or gray bars — so a layout can be judged before the copy exists.

Example usage
Greek everything below the fold; this review is about the structure, not the words.
Editor’s note

The name comes from “it’s all Greek to me,” and the most famous greeking text is Latin — the practice has always outrun its etymology. Greeking is honest early, when it keeps a review pointed at structure instead of word choice, and dishonest late: lorem ipsum never produces a widow, never overflows a button, never arrives in German. A layout isn’t finished until real content has tried to break it.