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 recurve bow â what you need to know. You can identify the recurve bow by the curved tips at either end of the bow, which increases the speed of the bow and the smoothness of the release. This bow is known for its widespread use in target archery and the Olympics, where it is the only style of bow allowed in competition.