Illustrated Glossary of Organic Chemistry

Staggered (staggered conformation): Two atoms and/or groups whose dihedral angle is 60o, or close to 60o. In other words, their bonds to the axis of rotation are not aligned. Also a conformation which contains this arrangement.

The Staggered Conformation of Ethane

Sawhorse projection
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Ball and spoke model
Space filling model   
Molecular model kit