Symbols

Tear Drop
The orb that appears to be the main symbol of the series. It first appears in Afternoon (3) as a red orb with yellow colored antenna, and the white version is used as the channel watermark

Speculation:

Anthony speculates in Revelations (19) that the symbol represents the garbage bag that Hollis is seen with in several video, and that Hollis is keeping the dismembered bodies of Jordan and the unnamed victim from the snuff film inside of it. He mentions that in its first appearance it has yellow handles that match that of the garbage bags. Presumably the red body of the orb would represent the blood and body parts contained within in this case. Hollis attempts to prove that the bag only contains supplies in A Sincere Conversation (20), but does not directly mention the symbol.

Stick Figures
Stick figures drawn by Hollis in "Lay Me Down To Sleep (11)"

Speculation: Some believe the two irregular figures to represent camera equipment while the other two figures represent people. What's interesting about this is that one of the people figures is seemingly injured with the legs disconnected from the bottom and no arms.