The circle (〇) symbol stands for a circle shape, but it is sometimes used to indicate something unspecified, for instance, 〇〇 san (which is the equivalent of Mr. X). Furthermore, a circle (〇) is used to acknowledge good work or results in the same way a checkmark ( レ ) symbol is used in the West. A double circle (◎) or triple circle is often used when the work is especially well done. Conversely, as in the West, an × is used when results are poor. A triangle (△) is often used when it is impossible to tell whether the results are good (○) or bad (×). A square (□) symbol has no particular meaning, but is used as a checkbox.