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I've seen some books with "本ノック" in the title, such as "Python実践データ分析100本ノック" and "有機化学1000本ノック 反応機構編" but can't figure out what it actually means.

I've also seen it used in a sentence like below:

実話100本ノックよ!!

For context, the speaker above is trying to prove to someone that ghosts exist, so they're saying something to the effect of "having 100 true stories."

It seems to be a counter used to make what's being counted sound more impressive than it actually is, but I have no idea.

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    dictionary.goo.ne.jp/word/…
    – user3856370
    Commented Jan 15, 2021 at 14:46
  • 野球のノックで自然に理解できる命名ですが，とくに情報学系の100問のドリルを100本ノックと呼ぶ流行としては，知ってる限りでは2012年に遡る言語処理100本ノック が一番古くかつ有名で，データ分析100本ノックはその流れではないかと思います．これはもともと東北大の研究室が由来のようです．
    – Yosh
    Commented Jan 15, 2021 at 15:16

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It's baseball jargon (see ３) for a type of fielding practice, but in this context the same term is used to mean repeated practice or drill in general.

Thanks to goldbrick for clarifying the baseball jargon.

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    One last question before I accept this as the answer. The whole batting practice fits helpful books perfectly, but what about the sample sentence in the OP, 実話100本ノックよ!!? How does practicing fit here? Or is it a different meaning this time? For context, the speaker is trying to prove to someone that ghosts exist, so they're saying something to the effect of "having 100 true stories."
    – Floating Sunfish
    Commented Jan 15, 2021 at 15:53
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    Oh you're right, I looked over that part. I'm guessing it means 100 examples of true ghost stories or something, but I'm not sure.
    – JansthcirlU
    Commented Jan 15, 2021 at 16:11
  • Ah, I see. So for the second part of my question, it really does seem to act as a counter. Alright, I'll wait a bit for further answers on the second part, but if no more are posted, I'll accept this one. Thanks again!
    – Floating Sunfish
    Commented Jan 15, 2021 at 16:19
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    (千本)ノック is a type of fielding practice (守備練習) rather than batting practice (打撃練習).
    – goldbrick
    Commented Jan 16, 2021 at 12:31
  • @goldbrick thanks, I'll update my answer
    – JansthcirlU
    Commented Jan 16, 2021 at 14:02

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