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 Compound Bow, unlike other traditional bows like the Longbow or the Recurve, which were both made of one piece of wood, the Compound Bow is a more sleek, advanced version of the traditional instrument. When disassembled, the bow can fit into a single tube, and is very light, only weighing about six pounds.