See also: Zule in Pictorial Dictionary of Heraldry.
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A stylized column — or perhaps it’s a table base? Either way, generally understood to be some kind of vertical-support-ish thing.
Default orientation: central portion palewise. No proper tincture.
Source: Beyeren Armorial. Artist: Claes Heinenzoon. (Folio 57r, arms of van Zuylen.) Adapted by Mathghamhain Ua Ruadháin.