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The Nyoi-bo, known in the Funimation dub as the Power Pole, is one of Goku's primary weapons in Dragon Ball. The Power Pole is a wooden, red, magical staff given to Goku from Grandpa Gohan. It has the ability to grow very, very long and then back to normal by the user's voice command. Often, Goku uses the Power Pole very creatively in Dragon Ball, and it is basically a lifesaver until he learns how to perform Bukujutsu(The Japanese Romaji word for flying).
The Power Pole actually originates from Kami's Lookout and Korin's Tower; Korin reveals that the Power Pole was the "ladder" connecting Korin's Tower and Kami's Lookout. Goku uses the Power Pole as a ride to go to Kami's Lookout, incidentally.
