“prohibit / forbid” in Japanese is 禁, read kin (きん). It is a Grade 5 Kyōiku kanji, taught in year 5 of Japanese elementary school, and appears in words such as 禁止 (prohibition).
What does 禁 mean?
ここは駐車禁止だ。
Same sound, different character — the classic trap. Compare them side by side: