mahlstick

A wooden stick with a padded head used by painters as a tool to support and steady the hand that holds the brush. Also spelled mahl stick, maulstick.

Self-portrait_at_the_Easel_Painting_a_Devotional_Panel_by_Sofonisba_AnguissolaSofonisba Anguissola. Self-portrait at the Easel. Oil on canvas. 1556. Łańcut Castle, Poland.