The normal sawing process by which most flooring is produced.
Lumber that has been sawn so the growth rings run between 0 and 44 degrees relative to the board's face.
Lumber sawn tangent to the tree's annual rings. Most lumber is Plain Sawn. Advantages in Plain Sawing: 1) Less costly and wasteful, hence more available; 2) Easier to kiln dry; 3) Averages wider widths.
the annual growth rings make an angle of less than 45 degrees with the surface of the piece. This exposes the pores of the spring wood and dense summer wood of the annual growth rings in ring porous woods to produce a pleasing grain pattern.