3.3.15 Square Symbol. The symbolic means of indicating that a single dimension applies to a square shape is to precede that dimension with the square symbol, as shown in Fig. 3-15. The symbol and the value are not separated by a space.
3.3.16 Dimension Origin Symbol. The symbolic means of indicating that a toleranced dimension between two features originates from one of these features and not the other is shown in Figs. 2-5 and 3-16.
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