Hadji is a term often used to refer to a person who has completed the pilgrimage to Mecca, known as the Hajj. This pilgrimage is one of the Five Pillars of Islam and is a significant religious duty for Muslims. Completing the Hajj is considered a profound spiritual achievement and is believed to bring great blessings. In some contexts, "Hadji" can also refer to a character in popular culture, such as in the animated series Johnny Quest. This character, Hadji Singh, is depicted as a young Indian boy who is a close friend of the main character, Johnny Quest, and often accompanies him on adventures.