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"Ad 2. sth sth...", where the 2 refers to a point/position/number mentioned in a list above. The Latin abbreviation is commonly used in Polish texts and means "to" in English but I'm not sure what's written in English in such cases.
Please write your explanation (if any) in Polish, English or German.
Explanation: Oddly enough, the English equivalent that I know is another Latin word: "re" - "in the matter of". I understand this as the normal form in formal contexts, particlarly legal.
In other contexts, e.g. international banks, I used to avoid this, to escape being accused of obscurantism, and used "On", but "re" is also used in English business contexts where a degree of traditionalism is accepted.
(I am writing from a British background, with some international awareness.)