“board / plank” in Japanese is 板, read han, ban, ita (はん, ばん, いた). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 看板 (signboard).
What does 板 mean?
先生が黒板に書く。
Same sound, different character — the classic trap. Compare them side by side: