X mark; cross mark
Used to indicate an incorrect answer, disagreement, cancellation, or to mark something as wrong. Often contrasted with 丸印 (circle mark).
See also: 丸印
テストの間違えた問題にバツ印をつける。
I put an X mark on the questions I got wrong on the test.
この書類の不要な項目にはバツ印を付けてください。
Please put an X mark on the unnecessary items in this document.
Compound of バツ (from the shape of the letter X, representing a cross or wrong mark) and 印 (mark, symbol).