Helmut Winkler wrote:A dot was never used as an abbr. symbol, it i is always used as a punctuation symbol
Helmut, you have a lot more education and background in this area than I do, and maybe it's a matter of translation, but this is from an English version of Cappelli:
It is in the section titled Abbreviation by Truncation, which Cappelli described as one of the six forms of abbreviation:

