The numeral 6 — Can be confused with a letter capital "G", or the lowercase "b", or the nine if inverted. In situations where the number 6 may appear at various angles (such as on billiard balls, some styles of playing cards and dice), it can be underlined (appearing as "6") or followed by a full stop (appearing as "6.") to indicate the proper viewing angle to disambiguate between "6" and "9"; a "9" may or may not appear with similar underlining or full stop (as "9" or "9."). It can also be written with a straight line rather than a curly line on top, appearing as "b".