Why the rainbow flag?
Use of the rainbow flag by the gay community began in 1978 when it first appeared in the San Francisco Gay and Lesbian Freedom Day Parade.
The flags had eight stripes, each color representing a component of the community: hot pink for sex, red for life, orange for healing, yellow for sun, green for nature, turquoise for art, indigo for harmony, and violet for spirit.
The next year pink and turquoise were removed from the design, and royal blue replaced indigo. This six-color version spread from San Francisco to other cities, and soon became the widely-known symbol of gay pride and diversity it is today.
Symbols of LGBT pride:
The LGBT rainbow flag.
The pink as well as black triangles.
The Greek lambda symbol ( a letter of the Greek alphabet: Λ )