SuStel:

The semicolon is also a stronger separator than a comma.

I didn't know that ! So, would you agree with the following statement ?

There are only three separators: dot comma and semicolon, and from
weakest to strongest, they are ranked as:

comma, semicolon, dot

There are other separators, like the em dash and en dash. I wouldn't try to make an exhaustive list. But your order is correct.

I don't know how you call the dot in english

Period or full stop. It's usually called a period in the US and usually a full stop in the UK, I think.

-- 
SuStel
http://trimboli.name