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 [Live Stream ON] and some older 3G models [Real Time ON])
GoCam and Ghost:
Most of the information on the GoLive 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 have internal rechargeable AA batteries in them, as well as an external power source, either a direct-connect solar panel or a 12V battery.