Bisexual pride flag
The bisexual pride flag was designed by Michael Page in 1998 in order to give the bisexual community its own symbol comparable to the Gay pride flag of the larger LGBT community. His aim was to increase the visibility of bisexuals, both among society as a whole and within the LGBT community. The first bisexual pride flag was unveiled on Dec 5th, 1998. 
Design and colors
Page took the colors from an existing bisexual symbol and gave it his own spin, saying,
|“||In designing the Bi Pride Flag, I selected the colors and overlap pattern of the 'bi angles' symbol.||”|
Page describes the meaning of the flag as this: "The pink color represents sexual attraction to the same sex only (gay and lesbian), The blue represents sexual attraction to the opposite sex only (straight) and the resultant overlap color purple represents sexual attraction to both sexes (bi)."
The flag's aspect ratio is not fixed but 2:3 and 3:5 are often used, in common with many other flags.
It is not patented, trademarked, or service marked.