Lettrist International was an avant-garde artistic movement founded in the 1950s in France. It emerged from the earlier Lettrism movement, which focused on the use of letters and words as artistic elements. The group aimed to challenge traditional forms of art and literature, promoting experimental practices in poetry, visual arts, and performance. The movement was associated with key figures like Isidore Isou, who sought to redefine the boundaries of artistic expression. Lettrist International emphasized the importance of spontaneity and innovation, influencing later movements such as Situationism and contributing to the development of contemporary art and literature.