The letter on the info strip at the bottom of the photo indicates what type of event caused the photo to be taken.
M = Motion-triggered
E = Event (a photo taken at a scheduled time or a manual photo)
T = Time-lapse
F = Photo taken after format SD card request has completed
S = Requested photo (only available on GoLive (all models) [Live Stream ON]) and some Verizon cameras on Verizon data plans)
U = Photo taken after firmware update request has completed
GoCam, GoCam 2, and Ghost:
GoLive, GoLive 2, and GoLive 3:
Most of the information on the GoLive (all models) info strip is the same as on the GoCam and Ghost info strips. However, there is additional power information on the GoLive info strip. Both cameras shown below have internal rechargeable AA batteries in them, as well as an external power source, either a direct-connect solar panel or a 12V battery.