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I've come across some characters like 々,ヽ,ゝ and so on . I want to know more about them and their usage
These are iteration marks. Used to repeat the same kanji / kana in writing.
々 is used in kanji
人々 - ひとびと - people
時々 - ときどき - sometimes
ゝ is used for repeating hiragana characters and ヽ is used for katakana