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Like in recent years, Google is showing support for the LGBT (lesbian, gay, bisexual and transgender) community by adding a rainbow next to search results for several related keywords, including "gay," "queer" and "transsexual."
The rainbow itself is non-clickable and the results of the searches seem to be unchanged. It's just a small nod from Google, a company that publicly expresses support for its LGBT employees and the community as a whole.