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 length should be at 2 times your draw length at a minimum. When your draw length is 30-inches, the recurve bow should be 60-inches or beyond. Measure from your longest finger, usually the middle one, to the same finger on the opposite hand, then divide that number by 2.5.