magic staff; Ruyi Jingu Bang
Refers to the magical staff wielded by Sun Wukong in the 16th-century Chinese novel 'Journey to the West'. It can change size at will.
Sun Wukong keeps his magic staff inside his ear.
From Chinese 如意棒 (Rúyì Bàng), literally 'as-you-wish staff', the name of Sun Wukong's weapon in 'Journey to the West'.