Historically, katana (刀) were one of the traditionally made Japanese swords (日本刀 nihontō)[2][3] that were used by the samurai of ancient and feudal Japan.[4] The katana is characterized by its distinctive appearance: a curved, single-edged blade with a circular or squared guard and long grip to accommodate two hands.
打刀(うちがたな)是日本刀的一種。一般而言,室町時代後所說的「刀」指的通常是打刀。
打刀的佩帶方法一般是刀鋒向上的,用腰帶把刀身夾住的方式,插在腰帶裡。
Source From/來源 https://en.wikipedia.org/wiki/Katana