Semicolon ;

Put a dot (.) over the comma (,) in order to obtain a semicolon (;)

         
Use a semicolon:
 
To avoid confusion where commas are already used in a sentence
To separate units of a series when they contain commas
After independent clauses and before the expressions:
However, then, thus, so, hence, in fact, in truth, that is, therefore, . . .. 
Between two independent clauses when the conjunction is omitted

Between two sentences joined by a conjunction but already have one 
or more commas within the first sentence
After a complete sentence and before introductory words 
when they are followed by a list of three or more 
items (For fewer than three items, simply enclose them in commas.)