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Pinna can refer to:

  • Pinna (anatomy), the outer part of the ear - also referred to as the auricle
  • Pinna (genus), a genus of bivalve molluscs also known as "pen shells"
  • In botany the pinnae are the divisions of a compound frond, analogous to the leaflets of a compound leaf
  • A part (cusp) of a crown (pinnae)