A link in chain indexing system which does NOT represent a subject with a definite name, but represents a connecting symbol or a digit indicating any relation is known as 

The Correct answer is ​False link.

Key Points

• Mechanism of Chain Indexing:
  • False Link:
    • ​​Chain Indexing involves the use of False Links, which are links originating from non-semantic digits, specifically indicator digits.
    • These indicator digits can be punctuation marks found in the CC, the digit 0 (zero), or a period (.).
    • Unlike representing a subject, a False Link serves as an indicator for the upcoming facet type.
    • Ranganathan classifies the Time Facet as a False Link, as it may not align with a specific verbal heading (CCC-5th ed., Rule KB Number 5, p. 288)
  • Unsought Link:
    • ​It is a substantive heading on which either there is no published material or a user is unlikely to ask or look for material on that subject in the library.
    • But it is not anything absolute and may differ from library to library.
    • It may depend upon the factors listed in the CCC itself (KB3, p. 288).
  • Sought Link:
    • ​It is a link that is neither false nor unsought.
    • The first link is always a sought heading.
    • The last link too is a sought heading if it does not end with a Time Facet.
    • A link from the Time Facet is a False Link.
    • Each Sought Heading generates one Class Index Entry. Thus, the number of class index entries depends upon the number of sought headings in the chain.
  • Upper Link:
    • ​It could be any link other than the last link.
    • It is relative to the broader/narrower terms.
    • An upper link for one may be a lower link for another.
  • Lower Link: A link next to its upper link
  • Missing Link:
    • ​It is a bypassed link that occurs in an un-modulated chain.
    • It is an invisible link without its rightful upper link

Additional Information

• Chain Indexing:
  • ​Chain Indexing is a cost-effective method for facilitating access to terms without duplicating the hierarchical arrangement of the classification in the alphabetical index.
  • Devised by S.R. Ranganathan, it is characterized as a "procedure for generating class index entries (i.e., subject index entries) that point from a class to its class number in a relatively mechanical manner."
  • To put it succinctly, chain indexing streamlines and simplifies the process of creating subject index entries based on the class numbers.