Possession (object)

Not to be confused with possession meaning a special ability.

A possession is a tangible object that can be owned and controlled by one or multiple individuals, usually belonging (legally) to one set person. Some possessions are considered "public domain" and have no one-and-only owner, which are often referring to works of art, literature, or the like found in established public buildings (libraries, museums, etc.).

Canon Material
Within the original Welcome to Hell comic, and later the film, material objects can hold symbolic purpose for any given character with the most prominent example being Sock's knife (possibly a kitchen knife according to the main Wiki), which he calls his "old friend" and once used to kill small animals prior to his death.

UC Stories
Within the Universal Clarification Series, there are several items of value that characters reveal throughout the storyline.

Sock Sowachowski
Sock maintains ownership of his favorite knife in death, most likely because he had it in hand when he used it to kill himself. He will occasionally offer it to Jonathan as a means of committing suicide and is somewhat upset when his human counterpart does not wish to take it.

Jonathan Combs
Jonathan's most prominently featured possession includes his purple headphones and music player (probably an off-brand iPod), which he wears on a daily basis before and after school. As he reveals to Sock when they were becoming better acquainted with each other, he is usually listening to his favorite band, Valhalla Soundbox, or other artists from similar genres.

Claire Hemlock
While Claire may have her entire skull collection as what she considers "valuable" to her, there are only a handful of objects she directly indentifies for significant meaning throughout the storyline. Pending...