Trigagon 

An engineering classification used to specify a three sided geometric shape whilst the term triangle is inexplicably unapparent.

During a problem solving exercise, the unexpected discovery of a trigagon in the solution prompted further examination.

Trigagon by Bangd Ingow January 26, 2014

Triagonal Sign 

I carress it, cause I possess it

And this triagonal sign!

Triagonal Sign by delete if u want December 19, 2016

Triagonal 

Stingy's favorite word. Meaning triangular. Popularized in Mine song by Lazy Town

This mailbox is mine, and this triagonal sign.

Triagonal by NarutoLoverXD December 30, 2016

and this triagonal sign 

The 2nd verse of the Mine Song

This mailbox is mine
And this triagonal sign
That blue balloon, The month of june...

and this triagonal sign by Whydoiexist:pOFFICALFacebook August 21, 2017

tritagonist

The third most important character in a story.

He is the tritagonist.

tritagonist by beShadows September 21, 2021

tritagonist

The third most important character in a story.

He is the tritagonist.

tritagonist by beShadows September 21, 2021

Trilagon 

When 3 or more people get so high and drunk that they all have sex and then puke because they are so drunk.

Look dude a trilagon let's join
Yeahh dude

Trilagon by Perfect differences November 23, 2019