The term dot in computing refers to a full stop or period, often seperating a file name from an extension, or different parts of an I.P. address or DNS name (e.g. www.wikipedia.org)
In punctuation, the term dot is usually reserved for the middle dot ·, or to the glyphs 'combining dot above' ̇ and 'combining dot below' ̣ which may be combined with some letters of the extended Latin alphabets in use in Eastern European languages.
Example characters: ċ/Ċ from Maltese and Irish Gaelic (old orthography), ė/Ė from Lithuanian, ġ/Ġ from Maltese and Irish Gaelic (old orthography), ŀ/Ŀ from Catalan, ż/Ż from Polish, etc..
The dot above the lowercase i and j is not seen as a dot, but rather as part of the character, and the double dots above several Latin letters such as ä, ë etc. are not dots either, but are Umlauts or diaeresis.