27f1c7fc___Common_Wood___Lumber_Defects__0
[2] A crack in the wood structure of a piece, usually running lengthwise. Checks are usually restricted to the end of a board and do not penetrate as far as the opposite side of a piece of sawn timber. [0] 
Check
B o w
C h e c k
C r o o k
C u p
S h a k e
S p l i t
T w i s t
W a n e
M a c h i n e B u r n
Sam Rogers' Common Wood & Lumber Defects
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