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Numbered squares keying clues to their starting cells.
Also known as: Crossword numbering, Grid numbering
A crossword numbers each cell that begins an entry, and the same number can start both an across and a down clue. British and American grids differ structurally: British grids are lattices with many unchecked letters, American ones interlock fully so every letter is checked.
Number the cells at which entries begin, one number serving both an across and a down clue where both start there.
Contexts: History
Differ structurally between traditions: American grids check every letter in two directions, while British grids leave many letters unchecked, which is why British clues are harder and more precisely worded.
Contexts: History
A square grid of light and dark cells, with small numerals in the upper left corner of some light cells.