A field sign is an unofficial differentiating mark worn on a combatant's clothing to show the difference between friend and foe or a combatant and a civilian.

Examples

*A tabard in the livery colors of a lord and bearing his coat of arms was a common field sign.
*A sash of colored cloth worn on the waist or over the shoulder.
**A red sash was worn by Imperial and Catholic troops of the Thirty Years War.
**A black and yellow sash was

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