What is jo?

Some articles on jo:

Jo, Zette And Jocko - Sources
... Jo, Zette et Jocko publications in Belgian Tintin and French Tintin BDoubliées (French) Footnotes ...
Timeline Of Portuguese History (Second Dynasty) - Second Dynasty: Aviz - 15th Century
... 1415 – João I conquers the city of Ceuta in northern Africa 1419 – Madeira Islands discovered by João Gonçalves Zarco and Tristão Vaz Teixeira. 1481 – João II of Portugal becomes king. 1483 – João II executes Fernando, the third Duke of Braganza, and Diogo, the Duke of Viseu, putting an end to high nobility conspiracies ...