It is not known for sure what the 'DS' stands for in Nintendo DS. Some think 'DS' is short for 'Dual Screen,' while others believe 'DS' stands for 'Developer's System.'
You can play your Game Boy Advance games with Nintendo DS, and vice versa.
Nintendo DS has two screens. The lower screen is a touch screen with a built-in microphone.
While in production, Nintendo gave Nintendo DS the code name, 'Project Nitro.'