More about the ".
" from Wikipedia:
A full stop (British, New Zealand and Australian English) or period (American English and Canadian English) is the punctuation mark commonly placed at the end of sentences. In the 21st century, it is often also called a dot. In conversation, as opposed to linguistics, the term is often used to mean "the end of the matter." (For example, "We are calling a full stop to discussions on this subject.")History
The full stop symbol derives from Aristophanes of Byzantium who invented the system of punctuation where the height of placement of a dot on the line determined its meaning. The high dot (.) was called a "periodos" and indicated a finished thought or sentence, the middle dot (·) was called a "kolon" and indicated part of a complete thought, while the low dot (.) was called a "komma" and also indicated part of a complete thought.http://en.wikipedia.org/wiki/Full_stop