When a dot is not

What do you call this little mark between the parentheses (.) ?

Of course, if it appears at the end of a sentence like this one, you say it's a period. but, depending upon its use, you should call it something else. 

For example, when used in software version numbers, that little mark is pronounced point: Mac OS  X 10.6.8 is “ten point six.point.eight” and iOS 7.1 is “seven point one.” (Also, the "X" in Mac OS X is pronounced "ten" not "X.")

In URLs such as http://www.applepower4u.blogspot.com/ and in email addresses such as applepower@tptd.net, it’s pronounced dot.

End of speech lesson.