NTSC
The National Television System Committe, often referred to as NTSC, was an analog television encoding system used primarily in North America, Japan, and parts of South America. While it has been made obsolete by the use of HDTV and digital component encoding, the term survives as a colloquial reference to the version of games and other televisual media released in the former NTSC regions.
Regional differences
Both Super Smash Bros. Melee and Super Smash Bros. Brawl were released in the NTSC regions of Japan and North America prior to PAL regions; in this "gap" between releases, both games were modified slightly in order to both adjust them for regional reasons, such as changing languages or information relating to release dates, or gameplay fixes, such as fixing glitches or changing properties of specific attacks.