The Nyoi-Bo is an unusual staff that changes length at the bid of the wielder. It's true function is to connect Karin's Tower to Kami's Palace, but it was bestowed to Son Gohan, who gave it to Son Goku before he died. 

Son Goku uses the staff when fighting in many battles throughout his child-hood, but eventually stops using the staff after he uses it to reach Kami's Palace.

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