The standard organization consists of the following structural units:

1. (a) Titles, which are numbered consecutively in Arabic throughout the Code;
2. (b) Subtitles, which are lettered consecutively in capitals throughout the title;
3. (c) Chapters, which are numbered consecutively in Roman capitals throughout each title;
4. (d) Subchapters, which are lettered consecutively in capitals throughout the chapter;
5. (e) Parts, which are numbered in Arabic throughout each title;
6. (f) Subparts, which are lettered in capitals;
7. (g) Sections, which are numbered in Arabic throughout each part. A section number includes the number of the part followed by a period and the number of the section. For example, the section number for section 15 of part 21 is “§ 21.15”; and

8. (h) Paragraphs, which are designated as follows:

   level 1 (a), (b), (c), etc. level 2 (1), (2), (3), etc. level 3 (i), (ii), (iii), etc. level 4 (A), (B), (C), etc. level 5 (1), (2), (3), etc. level 6 (i), (ii), (iii), etc.

[54 FR 9682, Mar. 7, 1989; 54 FR 23343, May 31, 1989]