The rainbow emoji shows a multicolored arc like the one seen after rain. It can mean rainbows, colorful things, good weather after a storm, optimism, or LGBTQ+ pride.
People use it in Pride posts, coming-out messages, queer-friendly profiles, and comments celebrating bright colors or happier times. It can also add a cheerful, whimsical tone, sometimes sincere and sometimes knowingly overdone.
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