You are mixing terminologies. "Period" is American English for the dot at the end of a sentence, and "full stop" is British. What the British call "brackets" Americans call "parentheses".
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
SnarfI've seen it both in and outside of itIt would help if you could cite or link to examples. The variations are legion.