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 X in its sights, it will dash toward him and explode on contact. 

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