The full stop, or period, or point, or dot is normally used to mark a sentence end in text.
A full stop is also seen used in one special context in action code: chaining operators together. Operators that can do this are referred to in Tinderbox as 'dot operators. For instance in this:
$MyList = $MyList.unique().sort();
The list stored in attribute called 'MyList' ($MyList) has been de-duplicated (.unique()) and A–Z sorted (.sort()) and written back over the original value.
A listing of dot-operators is available.
See also—notes linking to here: