Spine is one of those things that everyone talks about, but few completely understand. I'll try to provide some basic information and hopefully won't make too many mistakes.
Spine is basically a measure of the stiffness of an arrow shaft. More accurately, it is a measure of the deflection a shaft exhibits when a two pound weight is suspended from the middle of the shaft when the shaft is supported at two points 26 inches apart and the shaft is rotated so that the grain of the wood is vertical. This measurement is generally made with a device called, surprise, a spine tester. It is important that the grain of the shaft be oriented properly since a grained material exhibits different stiffness with and against the grain. Arrow shafts are measured to determine the greatest stiffness and that measurement is across the grain. Note that this is important because it tells you how to orient the fletching on the shaft.
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