Octavo: The eighth part of the traditional broadside sheet. For an A size paper, it equivalents to A3. Octavo can be abbreviated to 8vo. Used to describe book sizes. For example: Demy 8vo.

• 八开:传统原张纸的八分之一。以A度计，则相等于A3。英文缩写是‘8VO’，用来表示书籍尺寸。例如‘英式正度八开’。