As wsippel referenced, the term "Triforce" has been used for the arcade system board developed jointly by Namco, Sega, and Nintendo in 2002. Nineteen games have been released for the system, with F-Zero AX and Mario Kart Arcade GP (including its sequel) being the most proclaimed.
While I didn't find any official white paper regarding its specifications, here's a tenative list I've gathered from several outlets:
CPU: IBM Power PC "Gekko"
Sound DSP: Custom Macronix 16bit DSP @ 81MHz
Main RAM: Main Memory 48 MB MoSys 1T-SRAM, Approximately 10ns Sustainable Latency.
RAM: Version "A" upgradable RAM modules, up to 512MB (possibly higher)
RAM: Version "B" unknown
Graphics Engine: "Flipper" (Custom ATI/Nintendo)
Color: 24-bit Color, 24-bit Z Buffer.
Hardware Features: Fog, Subpixel Anti-aliasing, 8 Hardware lights, Alpha Blending, Virtual Texture Design, Multi-texture, Mapping/Bump/Environment Mapping, MIPMAP, Bilinear/Trilinear/Anisotropic Filtering, Real-time Texture Decompression (S3TC), HW 3-line Deflickering filter.
It's more or less an upgraded Gamecube. Perhaps Nintendo is investigating a next generation version of this, with Wii U as base. Seeing however the arcade industry's decline as of lately, I wouldn't bet on it. Other potential uses could be they are aiming to change the name of the Fun Center Mobile Entertainment Unit, supplied by Starlight Children's Foundation to hospitals. That unit, which is based on Wii, includes a hard drive for example, which all the games are stored on. The feedback on these units has been tremendous, so it's only natural for Nintendo to continue their partnership with Starlight. Seeing Wii U in hospitals later this year or at least in 2013 is probably not that far out.
Here's a repair guide (containing much information) for the Fun Center, if anyone is interested:
http://www.starlight.org/uploadedFi...ms/Fun_Centers/2009 Repair Manual PN65660.pdf