In heraldry, a bend is a band or strap running from the upper dexter corner of the shield to the lower sinister. Authorities differ as to how much of the field it should cover, ranging from one-fifth up to one-third. The supposed rule that a bend should occupy a maximum of one-third of the field appears to exclude the possibility of three bends being shown together, but contrary examples exist. Outside heraldry, the term "bend sinister" is sometimes used to imply illegitimacy, though it is almost never true that a bend sinister has this significance, and a "bar sinister" cannot, by its nature, exist.

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