The 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.
The closed book emoji was introduced in 2010 and released as part of the Unicode 11.0 standard. This emoji can be found under the objects category. Because the closed book emoji has been around for quite some time, it should display correctly in the majority of operating systems.

Here you'll find a range of emojis on how they will look using different operating systems. Each company will design an emoji according to their own style. Here we have listed the most popular platforms around to see how the emoji will look on their screens.

Short Codes:

:closed_book:

Hex Code:

📕

Decimal Code:

📕

Punycode:

xn--ut8h

URL Escape Code:

%F0%9F%93%95

JavaScript & JSON:

\ud83d\udcd5

CSS Code:

content: '\01F4D5';