Padawan braid (Earth-2356)

The Padawan braid was a symbol worn in the hair or head that marked the rank of a Jedi Padawan. When a Padawan was declared a Jedi Knight after passing the Jedi Trials, the braid was shed.

The braid was composed of a long strand of intricately woven hair typically worn across the right shoulder. In the case of Padawans who were of hairless species, alternatives such as silka beads were worn instead.

During his time as a Padawan, Obi-Wan Kenobi developed a bad habit of tugging at his Padawan braid when nervous, a habit he hoped to break.

Source

 * https://starwars.fandom.com/wiki/Padawan_braid