Boba Fett is one of the coolest-looking characters in Star Wars. His armor has become iconic, with many fans instantly recognizing it when it turned up in the first episode of The Mandalorian Season 2.
However, as well-known as Boba's armor is, many still don't know the meaning behind some of the symbols on it, namely the Mythosaur skull and Jaster Mereel's sigil. Although the history behind these emblems hasn't been explored in the films or television shows, they carry a special significance for both Boba and the Mandalorians.
Mythosaur Sigil
Of the two sigils on Boba's armor, the Mythosaur skull on his shoulder plate is more well known. According to Legends, the Mythosaurs were enormous beasts native to the planet Mandalore. Said to have had bodies the size of a small city, the creatures dominated the planet until the arrival of the Taung, a humanoid, warrior race from Coruscant. Led by a warrior known as Mandalore the First, they drove the Mythosaurs to extinction, took over the planet and began calling themselves "Mandalorians" after their leader. They even fashioned the Mythosaur bones into weapons and adopted the creature's skull as their emblem.
Although this story isn't technically canon, the Mythosaur skull prevails as the symbol of Mandalore in Star Wars canon. Aside from appearing on Boba's armor, a beskar replica of the skull can be seen above the entrance to the armory of Din Djarin's covert in Season 1 of The Mandalorian. He also has a pendant of the skull which he allows Grogu to hold onto. Additionally, the first official mention of the Mythosaur comes in Episode 1, when Kuiil tells Din that ancient Mandalorians tamed and rode the great beasts. While Boba Fett may not claim to be a Mandalorian himself, he is still the son of a foundling and he chooses to wear the symbol of Mandalore.
Jaster Mereel's Sigil
On his chest, Boba has another important, personal symbol. It features what appears to be a wheatsheaf, a red droplet and a letter of some sort. Some believe this it to be the Mandalorian crest or a symbol of the Fett clan, but in Legends, it was the sigil worn by Jango Fett's mentor, Jaster Mereel, when he was a Journeyman Protector on the planet Concord Dawn. The meaning behind the sigil's imagery has never been fully explained, but the wheat likely comes from the fact that Concord Dawn is an agricultural planet, and while the letter could be the Aurebesh symbol for D, what it stands for is unclear.
Jaster Mereel was a member of the Journeyman Protectors, the local law enforcement of Concord Dawn, until he killed a corrupt superior officer and was exiled from the planet. Following these events, he was taken in by the Mandalorians and even became the leader of the True Mandalorians. In their ensuing conflict with the Death Watch, Jaster saved Jango Fett when his parents were killed by the rogue group. Jaster then raised the boy himself until he was killed in the Battle of Korda Six. Afterward, Jango succeeded his adopted father as the next Mand'alor. In honor of his mentor, Jango displayed Jaster's sigil on his ship and later passed it down to Boba, who added it to his armor.
While this story is part of Legends and therefore, not considered canon, The Mandalorian may have changed that. The sigil was present on Boba's armor in the films, but it was made more prevalent after he repainted his armor in The Mandalorian. In Season 2, Boba explains to Din that his father was a foundling who fought in the Mandalorian Civil Wars. This appears to hint at Jango's Legends backstory, meaning the history of the sigil could now be partially canon.
Created by Jon Favreau, The Mandalorian stars Pedro Pascal, with guest stars Gina Carano, Carl Weathers and Giancarlo Esposito. Seasons 1 and 2 are streaming on Disney+.