“corner / horn” in Japanese is 角, read kaku, kado, tsuno (かく, かど, つの). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 三角形 (triangle).
What does 角 mean?
角を まがります。
Same sound, different character — the classic trap. Compare them side by side: