My favorite starter Pokémon are Bulbasaur, Charmander, and Squirtle.

Saburo is my best friend.

Sometimes, choosing one of three options can be difficult.

His new project meets all three important requirements: funding, personnel, and ideas.

He trains his triceps at the gym every day.

I hit the jackpot with a trifecta.

It's difficult to hit a trifecta.

His message ended with a three-dot ellipsis, suggesting something.

This figure is an acute triangle.

He taught me how to calculate the area of an obtuse triangle.