Alpha is often used in physics and chemistry as a symbol or in the names of things, for example alpha particles (which are two protons and two neutrons bound together into a particle the same as a helium nucleus). The symbol is also used a lot in mathematics in algebra, for example naming angles.
Recurve bow. A recurve bow is a bow with limbs that curve away from the archer when unstrung. A recurve bow stores more energy and delivers energy more efficiently than the equivalent straight-limbed bow, giving a greater amount of energy and speed to the arrow.
The Trophy Ridge Matrix bow sights have been made with a durable machined aluminum bracket and hardened steel pins. Choose from either the 3-pin or 5-pin sights for a choice of the type of sighting precision and range you require. Sight Features. 1  Vertical In-Line Pin Technology. 2  Horizontal and vertical micro adjustment.