From the Super Mario Wiki
The Triforce is a primary item in The Legend of Zelda series, and it is briefly featured in Adventure Mode in Super Smash Bros. Melee. In Stage 3: Underground Maze, the player explores the Underground Maze, searching for the Triforce. It is located on one of six podiums hidden in the maze. If they come across the wrong one, they end up fighting one of five Links. Once the Triforce was found, the player fought Zelda at the Temple.
The Triforce is also used to act as The Legend of Zelda's emblem, representing Link, Zelda, Young Link, Toon Link, and Ganondorf, next to their character portrait. The Triforce is also shown in the Triforce Slash in Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS / Wii U and Super Smash Bros. Ultimate.
In the The Legend of Zelda × Mario Kart 8 DLC pack of Mario Kart 8, there are the Triforce Tires and the Hylian Kite, both of which feature the Triforce, as well as the Triforce Cup. Link also briefly displays the Triforce as one of the tricks he can do.
There is an arcade unit called Triforce.