Sensei (先生, Sensei) is a Japanese title used to refer to or address teachers, professionals such as lawyers and doctors, politicians, clergymen, and other authority figures. It is also used to show respect to someone who has achieved a certain level of mastery in an art form or some other skill: accomplished novelists, musicians, and artists are addressed with the title in this way; for example, Japanese manga fans refer to manga artist Osamu Tezuka as "Tezuka-sensei." Sensei is also one of the common Japanese martial arts titles.