The display width of the contents of the cell, which will be 1 (typical western characters, as well as ambiguous characters), 2 (typical CJK characters), or in some cases 0 (empty content, control characters, zero-width whitespace). Note that cells immediately following a cell with a wide character will themselves generally have no content (as their screen display real-estate is consumed by the wide character.)
styling for the cell
Cell represents the contents of a single character cell on screen, or in some cases two adjacent cells. Terminals are expected to have a uniform display width for each cell, and to have a fixed number of cell columns and rows. (We assume fixed pitch fonts.) The occasion when a double wide character is present occurs for certain East Asian characters that require twice as much horizontal space to display as others. (This can also occur with some emoji.)