Mill (heraldry)

Windmills or water mills are sometimes used as a charge in heraldic arms, usually as a sign for agricultural or industrial endeavors.¹

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  A water mill in the arms of Viana de Jadraque, Spain
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  A former coat of arms of the municipality of Säkylä, Finland
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  Mühldorf am Inn (canting, since the name means "Mill village on the Inn")
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  The arms of Bonsmoulins, France, with a millwheel in the base
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  The arms of La Courneuve, France, with a millwheel in the door opening
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  Nacka, Sweden (Swedish variant)
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  Forssa, Finland
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  Bolivar family in Biscaya