“sword / blade” in Japanese is 刀, read tou, katana (とう, かたな). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 日本刀 (Japanese sword).
What does 刀 mean?
侍は刀を持っている。
Same sound, different character — the classic trap. Compare them side by side: