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The Nintendo DS having two screens was suggested by former Nintendo president Hiroshi Yamauchi to then-current president Satoru Iwata, and was inspired by the Game & Watch LCD game series' clamshell two-screen design. In a 2016 Retro Gamer interview with former Nintendo designer Satoru Okada, he delves into its origins:

"The project was moving forward at a good pace but during the development, something at unexpected happened. President Iwata then came to see me. He was obviously bothered and he said: 'l talked to Yamauchi-san over the phone and he thinks your console should have two screens... A bit like the multi-screen Game & Watch, you see?' [...] at the time, everybody hated this idea, even Iwata himself. We thought it did not make any sense. Back in the Game & Watch days, it was different because a second screen allowed us to double the playing area and the number of graphic elements on display. But with the modern screens, there was no point. We were free to choose the size of our screen, so why bother splitting it into two? Especially considering that it was impossible to look at both screens at the same time. This is why we did not understand his idea."
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A Nintendo DS system has been to the top of Mt. Everest, and even faired better than many other electronic devices on the journey.
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The Nintendo DS is based on a prototype system called Iris, which was intended to succeed the Game Boy Advance. The name Iris comes from the Japanese Iris plant, or Iris Ensata. This is evident by the name of Intelligent Systems's official DS emulator provided with DS development kits: Ensata.
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The 'DS' in Nintendo DS is short for "Developers' System" or "Dual Screen".
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A trademark filed by Nintendo in 2004 suggests the Nintendo DS was originally going to be named "City Boy," expanding on the Game Boy brand and putting an emphasis on taking the device with you in your everyday life.
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In the Nintendo Wi-Fi Connection Instruction Booklet, the fake WEP Key used is '8675309', a reference to Tommy Tutone's "8675309/Jenny".
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There is an unused button called a "DEBUG" which is only present on development units. It is however possible to get this to work under emulation.
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