The White Knot is a symbol of support for Same-sex marriage in the United States.
The White Knot combines two symbols of marriage, the color white and "tying the knot" to represent support for same-sex marriage.[1] The White Knot has been worn publicly by many celebrities as a means of demonstrating solidarity with that cause.[2][3][4][5][6][7][8][9][10]
From the WhiteKnot.org website:
The White Knot is the symbol for marriage equality. Wear it every day to show your support and to create conversation. Use it to tell someone today that equal rights are important to everyone. Share the White Knot and spread the word that all loving couples deserve the same legal rights, benefits, and respect that civil marriage bestows. Visibility is the goal. Whether you are gay, straight, or otherwise, please show your support by wearing the Knot and telling people why you are wearing it. Wear your White Knot to work, to school, to your place of worship. Together, we will keep the topic at the top of people's minds and keep the conversation going.
The White Knot was created by Frank Voci in November 2008, in response to the passage of Proposition 8 in California and bans on same-sex marriage and denial of other civil rights for LGBT persons across the nation.[11]