Handkerchief code

Rarity: Common

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What Wikipedia says

The handkerchief code (also known as the hanky code, the bandana code, and flagging) is a system of color-coded cloth handkerchiefs or bandanas for non-verbally communicating one's interests in sexual activities and fetishes.

Excerpt from the Wikipedia article “Handkerchief code”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: thehankycode, CC BY-SA 2.0, via Wikimedia Commons.