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 is a newer and more up-to-date bow with a plethora of features. The recurve bow is a traditional bow due to its shape and has been around for hundreds of years. They are simply a single bow body with a string. They are made today of fiberglass and carbon for durability and strength.