A device used to maintain a chosen line or to maintain a stable position.

Description of a light source that is attached to a frame but appears to illuminate all objects with equal intensity, as if it were at an infinite distance from the objects. Directional light has orientation but no position, and it is commonly used to simulate distant light sources, such as the sun.

A hypothesis which predicts that one group will have a higher or lower result than another group

Any auxiliary anchor point used to position the rope in the strongest possible location

Directional trading involves taking long or short positions on the belief that profits can be made by correctly predicting the direction of a security.