Handkerchief code

The Handkerchief Code, also known as the "flagging" or "hanky code," is a system of color-coded handkerchiefs or bandanas used primarily within the LGBTQ+ community, particularly among gay men, to indicate sexual preferences, kinks, or interests. The code originated in the 1970s and has evolved over time. Typically, a person will wear a colored handkerchief in their back pocket (left or right) to signify different roles or interests.