The 'O' represents the base where skydivers land at the end of their jump. Under the word XP, there's a pulse line, which peaks to represent the adrenaline of the jump and leads to the base.
This line is also easily drawable by pen as a signature..:)
We like these designs, do you think you could combine the red XP with the heartbeat (from entry #3) into the entry #2 logo? We'd like to see what that looks like. Also, potentially have the heartbeat fade from peaking on the left to shallow on the right?
Wanted to give another comment, we think the "Turbo" aspect of the name should have the most emphasis. The Carolina and XP are less of an emphasis compared to that part of our name
For the #7 design, could you make the "Turbo" part of the word red, and make the XP superscripted in blue? Also, if you could incorporate into this design the pulse found in design #4, and possibly make it running through the word Turbo, a thought would be to make the target end on the "o" in "Turbo". Another suggestion would be maybe all caps in the carolina wording.
Had to keep the pulse across the word turbo in check or else it'll disturb the way the words look. (ie, i can't have the pulse as big as design #4)
The small preview here doesn't show as much of the details as I would love to but they look fine in actual size...2 variations of the XP for consideration. Do let me know if there's anything else you prefer then.