The Collaborative International Dictionary
Interpunction
Interpunction \In`ter*punc"tion\, n. [L. interpunctio, fr. interpungere, interppunctum, to interpoint. See Inter-, and Point.] The insertion of points between words or sentences; punctuation.
Douglas Harper's Etymology Dictionary
Wiktionary
interpunction
n. The insertion of points between words or sentences; punctuation.
Usage examples of "interpunction".
As interpunction is never used in cipher of this kind, the dots could only be signs of abbreviation.