An ear was part of the humanoid anatomy, usually on either side of the humanoid head. Ears were primarily used for hearing. Han Solo once pretended to have his ear cut off by a laser scalpel during a mock-torture session. The Gand species possessed earholes.
Ears would reasonably appear in all Star Wars material. This list contains appearances where "ear" is explicitly described.
- Star Wars: Knights of the Old Republic 10: Flashpoint, Part 3
- Star Wars: Darth Plagueis
- Coruscant Nights I: Jedi Twilight
- Star Wars Episode V: The Empire Strikes Back
- The Prize Pelt: The Tale of Bossk
- Hard Merchandise (As "earholes")
- Dark Nest I: The Joiner King
- Dark Nest II: The Unseen Queen
- Dark Nest III: The Swarm War
- Ear on Wikipedia