from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A shape composed of three equilateral triangles arranged in such a manner that a fourth triangle of equal shape could be fit in between them.
- v. To successfully post three Unicode triangles (▲) arranged in this configuration, especially at 4chan.
tri- + force. First used in the Legend of Zelda franchise for a magical entity in that fictional universe. (Wiktionary)