a lavender rhinoceros symbol for a public ad campaign to increase visibility for gay people in Boston helmed by Gay Media Action-Advertising; Toale said they chose a rhinoceros because "it is a much maligned and misunderstood animal" and that it was lavender because that is a mix of pink and blue, making it a symbolic merger of the feminine and masculine. However, in May 1974, Metro Transit Advertising said its lawyers could not "determine eligibility of the public service rate" for the lavender rhinoceros ads, which tripled the cost of the ad campaign. Gay Media Action challenged this but were unsuccessful. The lavender rhinoceros symbol was seen on signs, pins, and t-shirts at the Boston Pride Parade later in 1974, and a life-sized papier-mâché lavender rhinoceros was part of the parade. Money was raised for the ads, and they began running on the Massachusetts Bay Transportation Authority's Green Line by December 3, 1974, and ran there until February 1975. The lavender rhinoceros continued as a symbol of the gay community, appearing at the 1976 Boston Pride Parade and on a flag that was raised at Boston City Hall in 1987. Unicorns Unicorns have become a symbol of LGBT culture due to earlier associations between the animal and rainbows being extended to the rainbow flag created in 1978 by Gilbert Baker. Alice Fisher of The Guardian wrote in 2017, "The unicorn has also done its bit for the LGBT community in the last century... Rainbows and unicorns are so intrinsically linked (the association is also a Victorian invention) that it's unsurprising that the magic creature started to appear on T-shirts and banners at Gay Pride around the world, with slogans such as 'Gender is Imaginary' or 'Totally Straight' emblazoned under sparkling rainbow unicorns." Gay Star News has said unicorns are "queer icons of our time". Triangle badges of Nazi Germany One of the oldest of these symbols is the downward-pointing pink triangle that male homosexuals in Nazi concentration camps were required to wear on their clothing. The badge is one of several badges that internees wore to identify what kind of prisoners they were. Many of the estimated 5,000–15,000 gay men imprisoned in concentration camps did not survive. The pink triangle was later reclaimed by gay men, as well as some lesbians, in various political movements as a symbol of personal pride and remembrance. AIDS Coalition to Unleash Power (ACT-UP) adopted