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Vertical strokes whose crossbars count the height of the stitch.
Also known as: Treble crochet symbol, Double crochet symbol, T shapes in a crochet diagram
A T shape with crossbars. Each bar on the stem is one yarn-over, so the number of bars gives the stitch's height directly — a genuinely elegant notation, and the place where British and American names collide worst.
A vertical stroke with crossbars, in which each bar represents one yarn-over and therefore one unit of the stitch's height: no bar for the shortest stitches, one bar, two bars and so on for progressively taller ones.
British and American names for these stitches conflict directly. A British double crochet is an American single crochet; a British treble is an American double. The same words name different stitches in the two systems.
Not a spelling difference. Following the wrong convention produces a fabric of the wrong height and gauge throughout.
The symbols are unaffected by the naming conflict, which is a substantial argument for charts over written patterns in international publishing: the diagram is unambiguous where the words are not.
A vertical stroke crossed near the top by a horizontal bar, with additional short bars crossing the stem lower down according to the stitch height.