Response

Immediacy

Sometimes conversation goes a little bit quicker or there is a need to show reaction to parts of the content.

Interjection

☶: +☶, I think that's a good idea.. <-- ☶: -☶-, NO The <-- denotes the strength of the interjection. Also, since this is an interjection, the $interval of .. is is halved.

Tone Response

☶: ☶, do you agree with me <+☶, okay cool, good to hear <+☶.

The directionality is implicit_.

Accord

The documenter may observe that there is a call and echo sort of accord through a conversation.

☶: ☶, omg the new blabla from blabal:☶ was so blabla:☶ and the blabla:☶ was off the blabla:☶.