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.
Match your calculated draw length to the appropriate bow size in the chart to the left. NOTE: I always round the calculated draw length up to the nearest 1/2 inch for recurve bows. It is preferable to shoot a longer bow than one that might be too short. Go here to learn more about why determining your proper equipment is important in archery.