Board, A Plank, Plank
Noun
いた
2chの野球板に書き込みをしたんですが、板違いだと言われてしまいました。
I posted some comments on a forum about baseball on 2chan, but I was told it was the wrong board.
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you to remember:
When you get hit in the face with a board, it hurts. It is very 痛い (いた).