N-S Crest is a pair of gadgets that resemble badges with the letter N or S on it. It corresponds in the similar manner a magnet is for one person wearing them with another person that is also wearing them.
When two persons wears the same Crest (either N or S), they will repel each other, just like how magnets works. While if one person wears the N Crest while the other wears the S Crest, they'll be attracted to each other. Simply put, the Crest itself cause the person to become a magnetic pole themselves (theoretically speaking).
- Chapter 28:N-S Crest
- N-S Badges
- Shizuka's Present is Nobita
- Nobita and the New Steel Troops ~Angel Wings~
|N-S Badges||Nobisuke||Tamako||To demonstrate the gadgets' use, Doraemon secretly attaches N on Tamako and N on Nobisuke. He later claims Papa has called for Mama, and they repel each other when she tries to approach him.|
|Nobisuke||Tamako||Doraemon and Nobita see them quarreling, and Doraemon replaces Tamako's badge with a S, causing Tamako and Nobisuke to bump into each other.|
|Nobita||Gian|| Gian approaches Nobita with a S, who is shocked to learn Doraemon had not attached the badge on him. He attaches it in time so that Nobita could avoid Gian's attacks.|
Later, Nobita tries to attract himself to Shizuka with an N, but eventually Gian captures him with a rope and tries to defy the physics of magnetism to attack Nobita. The rope breaks, and sends Gian flying up the sky.
|Nobita||Shizuka||Nobita finds Shizuka and accidentally attaches S on her, sending her jumping when Nobita chases after her.|
|Nobita||Gian||To attract Shizuka to his side, Nobita replaces his badge with an N, but this time, he ends up being attracted to an unconscious Gian unexpectedly.|
- Doraemon is able to replace Tamako's badge easily. However, Nobita is unable to tear off the S badge and has to take off his shirt to attach the N badge on his singlet.
- In 1979 anime, N badge is blue and S badge is red.
- In Nobita and the new Steel Troops Angel Wings the gadget was seen as Guns.