Pink triangle identity, and was incorporated into the logos of such organizations and businesses. It was also used by individuals, sometimes discretely or ambiguously as an "insider" code unfamiliar to the general public. The logo for the 1987 March on Washington for Lesbian and Gay Rights was a silhouette of the US Capitol Dome superimposed over a pink triangle. Taking a more militant tone, the AIDS Coalition To Unleash Power (ACT UP) was formed by six gay activists in New York City in 1987, and to draw attention to the disease's disproportionate impact on gay and bisexual men, and the apparent role
Reuleaux triangle a figure of three overlapping semicircles (each two of which form a vesica piscis symbol) that again has a Reuleaux triangle at its center; just as the three circles of the Venn diagram may be interlaced to form the Borromean rings, the three circular arcs of the triquetra may be interlaced to form a trefoil knot. Relatives of the Reuleaux triangle arise in the problem of finding the minimum perimeter shape that encloses a fixed amount of area and includes three specified points in the plane. For a wide range of choices of the area parameter, the optimal solution to