OOO — Common Crossword Answer

Why is OOO common in crosswords?

OOO is a 3-letter crossword answer that appears regularly in published crossword puzzles. Constructors rely on versatile entries like OOO to fill tight grid spaces and connect longer theme answers. Its vowel-heavy structure makes it easy to slot into many grid patterns. Short entries like this are especially valuable in compact crossword formats such as daily minis.