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This is an excerpt from The IBM Style Guide for technical writers:

In books, use a period in titles for chapters and appendixes. Insert the period after the name of the entity and the identifying number or letter and before the descriptive name.

Examples
Chapter 1. Introduction to InfoBase
Appendix A. Performance considerations
Appendix B. Conversion tables

Why don't the authors write it as follows?

In books, use a period in titles for chapters and appendixes. Insert a period after the name of an entity and the identifying number or letter and before the descriptive name.

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  • I believe that is because "period" is only, well, a period. There are not many things like the period or the full-stop. It is unique. There are not types as such. – Dhanishtha Ghosh Jan 9 at 13:22
  • @DhanishthaGhosh But they use "a period" in the first sentence. – jsv Jan 9 at 13:25
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    But that's the point. They have told you to use a period. Where do you use that period? After the name of the entity. – Daniel Roseman Jan 9 at 13:27
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    I agree with Daniel. On the other hand, I would like to add that 'an' instead of 'the' in the second sentence would work just fine. Like the entity can be any entity in general, and the descriptive name can be a descriptive name or title for anything in general. – Dhanishtha Ghosh Jan 9 at 13:32
  • OK, guys, thanks. It seems now I understand. – jsv Jan 9 at 13:38

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