Here's some curious info about YMCA:
The YMCA idea, which began among evangelicals, was unusual because it crossed the rigid lines that separated all the different churches and social classes in England in those days.
George Williams was knighted by Queen Victoria in 1894 for his YMCA work and buried in 1905 under the floor of St. Paul's Cathedral among that nation's heroes and statesmen. A large stained glass window in Westminster Abbey, complete with a red triangle, is dedicated to YMCAs, to Sir George and to Y work during the first World War.
Note the "red triangle/pyramid" on the British currency.