In which edition of CC A New indicator digit "&" (ampersand) is used in place of old indicator digit "0" (zero) for Phase Relation.

The Correct answer is 7th.

Key Points

• In Edition 7 of CC (1987), several changes were introduced.

Some of the key updates include:

• The number of Main Subjects/Basics Subjects was increased.
• Some subjects were divided into canonical divisions (e.g., Book Science, Research Technique).
• Certain isolates, like [1PI], were treated as canonical divisions in subjects such as Engineering, Technology, Geography, and Economics.
• New formations, such as agglomeration (Subject Bundles), were added as canonical divisions.
• Systems and specials were reclassified as Basic Subjects.
• The double inverted comma (") is now used to indicate an "Anteriorising Isolate" instead of Roman small letters, which were used in Edition 6.
• [E], [MIT], and [P] are now recognized as Common Fundamental Category Isolates.
• The ampersand (&) replaces the zero (0) for Phase Relation.
• Facet formula changes were made, particularly the insertion of a comma (",") before Level 1 of the [P] facet in any Round or subject.