The Big "O" is a hillside letter representing the University of Oregon, located at Skinner Butte in Eugene, Oregon.

Built in 1958,[2] the sign was added to the National Register of Historic Places on September 23, 2010.

[3] Every year, members of the university community hike up the butte to give the sign a fresh coat of paint.

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This article about a property in Oregon on the National Register of Historic Places is a stub.