What the Rainbow has given our People is a thing that connects us

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicolored circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

(that's my little sister posing for me)
Of course, rainbows and rainbow flags carry significance outside the LGBT community. The rainbow is an important symbol in the Bible, representing a promise of peace from God to Noah, and some Christian groups have used that symbol in their iconography.