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A small square before a dimension, marking a square feature.
Also known as: Across flats square marking
A small square before a dimension says the feature is square in section, so one dimension serves for both sides. It saves a second dimension and a second view, which is why it appears on shafts and spigots.
Marks a feature as square in cross-section, so a single dimension applies to both across-flats measurements.
Contexts: Technical drawing
Removes the need for a second dimension or a second view, which is its practical purpose on a drawing.
Contexts: Technical drawing
A small square with equal sides drawn immediately before a numeral in a dimension.