There's no need for this. Nintendo doesn't 'own' a public domain symbol/image. The 'Triforce' is the symbol of the ancient Hojo clan ( 北条氏 ) of Japan. Nintendo can't copyright or trademark it. They can try but they will get laughed out of court just like Universal Studios did when they tried to sue Nintendo over Donkey Kong being a ripoff of King Kong (which itself is also a public domain creation).
The Triskelia is also a good candidate as it originates several thousand years ago and has been imprinted on weaponry, armor, pottery, and other similar types of items.