All notations will be framed in brackets for transcription but parentheses for captioning.  

With an Arial font for captioning the parenthesis feels more comfortable in our opinion.

[laughs]  (laughs)
[sic]  (sic)
[inaudible]  (inaudible)
[clears throat]  (clears throat)
[chuckles]  (chuckles)
[sp?]  (sp?)