shirabe.org
1)

○

○
Meaning
    1. ①
      circle
      sometimes used for zero
      See also: 丸 (まる)
    2. ②
      "correct"; "good"
      when marking a test, homework, etc.
      See also: 二重丸 (にじゅうまる)
    3. ③
      Unclassified
      *; _
      placeholder used to censor individual characters or indicate a space to be filled in
      See also: 〇〇 (まるまる)
    4. ④
      period; full stop
      See also: 句点 (くてん)
    5. ⑤
      handakuten (diacritic)
      See also: 半濁点 (はんだくてん)
Forms
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2)

〇〇まるまる

まるまる
✨
Meaning
    1. ①
      symbol used as a placeholder (either because a number of other words could be used in that position, or because of censorship)
    2. ②
      certain; unnamed; undisclosed; unidentified
Forms
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3)

〇×まるばつ

まるばつ
Meaning
    1. circle and cross; right and wrong (answers); true-false
Forms
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6)

〇×まるばつテスト

まるばつテスト
Meaning
    1. true-false test; yes-no test
Forms
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