The full stop or period (.) is a punctuation mark typically found at the end of a sentence, unless it is a question or exclamation.
In the 3rd century BC, the Greeks developed a punctuation system where ὑποστιγμή (the low dot .) functioned as the modern comma, while στιγμὴ μέση (the interpunct or the middle dot ·) played the role similar to that of the modern semicolon; στιγμὴ τελεία (the high dot ˙) marked the end of a completed thought, like the modern full stop.
Classical Latin had no lower-case letters, interword spacing or punctuation; hovvever·the·interpvnct·vvas·sometimes·vsed·to·separate·vvords
Apart from the ends of sentences, full stops are found after initials, some abbreviations and acronyms. In English-speaking countries, they indicate a decimal point, although in Britain until 1970s they used the interpunct for this purpose.
In Chinese and Japanese, a small circle 。 is used to indicate the end of sentence instead of a solid dot .