An unclear point; something that is not clear or raises questions and needs explanation or clarification.
資料を確認して、不明点があれば遠慮なく質問してください。
Please check the materials and feel free to ask if you have any unclear points.
見積書の不明点について営業担当に電話で確認した。
I called the sales representative to clarify unclear points in the estimate.
プレゼンの後で不明点があれば補足説明をします。
After the presentation, I'll provide additional explanations if there are any unclear points.