Closed Book emoji is the picture of a red (or brown in some versions) book, the name of which obviously indicates its position opposite to that of Open Book emoji. There's an inscription "Vol.1" or just "Book" on its cover. Unsurprisingly, it is used in any contexts related to reading or writing books, literature, as well as in the relation to education and researching.
📕 Closed Book emoji
refers to the drink and food