"dot matrix : (computing) A two-dimensional array or pattern of dots used (for example, by a display..."

“dot matrix : (computing) A two-dimensional array or pattern of dots used (for example, by a display device or a printer) to represent alphanumeric characters and pictures.
(computing) Clipping of dot matrix printer.
German inventor Rudolf Hell, who developed a dot-matrix-based teleprinter called the Hellschreiber in the 1920s, died on this day in 2002.”

- https://en.wiktionary.org/wiki/dot_matrix

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