TriScan

TriScan (トライスキャン) is a triangular program that appears in Cyber Peacock's stage in Mega Man X4. Once it has you in it's sights, it will dash toward you.

TriScan Gold
TriScan Gold (トライスキャンゴールド) is a modified TriScan that appears in the last stage of Mega Man X5.