The triangle, if it were a full triangle, made of four smaller triangles, would give for its user the state of being a deity. It gives its user the state of divinity.

The fourth piece, and central part, of the full triangle represents imortality. While the other three pieces represent courage, wisdom and power.

Ganon lose the battle against Link in the end of Ocarina of Time, because despite having the use of the Triforce, having the power, the wisdom, and the courage, he lacked the imortality.

The origin, status, state and location of the fourth piece, and central part, of the full triangle is unknown.

There is no fourth piece which is why it's absent from all other iterations of the Hylian shield.

>>714727225 (OP)
If this is really your headcanon, Hylia probably has it. But I don't give a that much of a shit about lore or what is/isn't canon.