The blade length (nagasa) is measured in a straight line from the mune-machi (back blade notch) to the tip of the kissaki (point). The nakago is measured from the mune-machi to the tip of the nakago (nakago-jiri). The kissaki (point) is measured from the yokote to the tip of the kissaki. Sori (curvature)(see below) is measured from the back of the blade (mune) at the widest point on a straight line from the mune-machi to the tip of the kissaki (point).
Blades with little or no curvature are termed "mu sori".
Some tanto may have a slight reversed inward curvature (uchi sori).
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