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A thread count written as colour codes and numbers, defining a tartan.
Also known as: Thread count notation, Tartan specification
A tartan is defined by its sett: a written thread count giving each colour and the number of threads of it, in order. Because the pattern repeats and reflects, that short string fully determines the cloth — a weaver anywhere can reproduce a tartan from its sett alone. The colours are written as short codes, the numbers as thread counts, and a slash or a stroke marks a pivot where the sequence reverses. It is one of the few textile patterns that exists as a written specification first.
A row of short letter codes each followed by a number, separated by strokes, standing for a pattern of crossing coloured bands.
Both are written specifications a weaver works from.