noun
A physical or digital marker placed between pages to keep one's place in a book.
読みかけのページにしおりを挟んだ。
I put a bookmark in the page I was reading.
noun
A booklet or pamphlet providing guidance, often for sightseeing, museums, or events. Less common than the bookmark sense.
美術館の入り口で展示のしおりをもらった。
I got a guide to the exhibition at the museum entrance.
Rare kanji form; literally 'branch folding', reflecting an old practice of marking a path by breaking a twig.
Originally from the verb 枝折る (しおる, 'to bend a branch'), referring to the practice of breaking a twig to mark a trail. The kanji 栞 is a later assignment. The exact derivation is uncertain.