Biohazard is an emoji from the “symbols” group (Unicode 1). Keywords: sign.
U+2623
:biohazard:
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🏧🚮🚰♿️🚹️🚺️🚻🚼️🚾🛂🛃🛄🛅⚠️🚸⛔️🚫🚳🚭️🚯🚱🚷📵🔞