So....you are a Japanese woman who uses the English and "Ameriucan" (sic) versions of the term "Period".  Let's take the definition from Wikipedia itself on "Full Stop": "A full stop or period (sometimes stop, full point or dot), is the punctuation mark commonly placed at the end of several different types of sentences in English and many other languages."  So, saying "Period/Full Stop" is the same as saying "Period/Period" or typing "./.", interesting.

While this has been great fun, I would rather talk to someone who a slight amount of sense, maturity, and able to speak proper English and not butcher the English Language (both British and American versions) and not get them confused.  So, Good Day to you, Ma'am. -