A closed, blue, hardcover book. Commonly used for various content concerning reading, writing, learning, and schooling. May also be used as a blue accent color.
Apple’s cover features the easter egg Vol. 3 by John Appleseed, Samsung’s reads Blue Book. Note that in the U.S., this emoji may be associated with blue book exams and the Kelley Blue Book.
Blue Book was approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015.