+**Os** refers to osmium, a chemical [Element](/wiki/element) with the atomic number 76. It is an extremely dense, hard, and brittle [Transition Metal](/wiki/transition-metal), known for its blue-gray appearance and high resistance to corrosion.
+## See also
+- [Osmium](/wiki/osmium)
+- [Metal](/wiki/metal)
+- [Chemistry](/wiki/chemistry)
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