The Commens Dictionary
Quote from ‘Foundations of Mathematics [R]’
If a sign refers to an object well known already to utterer and interpreter, and gives neither party any latitude as to what it represents, it may be called a singular sign, or singular.
MS [R] 10:1
‘Singular’ (pub. 21.08.17-11:18). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-foundations-mathematics-r-8.