tactic block 

in a polymer
https://doi.org/10.1351/goldbook.T06242
A regular block that can be described by only one species of configurational repeating unit in a single sequential arrangement.
Source:
Purple Book, 1st ed., p. 17 [Terms] [Book]
Citation: 'tactic block' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.T06242 RIS BibTex EndNote
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Last revised: February 24, 2014