noun
left-handed coordinate system
Technical term in computing and mathematics for a coordinate system where the orientation follows the left-hand rule.
Direct3Dでは左手座標系が使われている。
Direct3D uses a left-handed coordinate system.
右手座標系 is the right-handed coordinate system, which is the opposite orientation.
Compound of 左手 (left hand) + 座標系 (coordinate system).