Lekku are long, head-tails that extend from the tops of the heads of certain species in the Star Wars universe, particularly the Twi'leks. These appendages are often used for communication and can express emotions, similar to how humans use facial expressions. In addition to their communicative function, lekku can also serve a cultural purpose. They are often adorned with jewelry or tattoos, reflecting the individual's identity and heritage. The length and appearance of lekku can vary significantly among different Twi'lek individuals, contributing to their unique characteristics.