Here's what I have posted about Fenix's naming system(also on the Welcome Mat):
Here's how it works. All are Type 3/HA unless otherwise stated.
E = AAA powered
P = CR123 powered
L = AA or AAA powered
T = CR123 powered with a forward clickie, two mode, tighten for high, loosen for low, uses a Cree XR-E Q5 LED (for now; when they add more models, this might change)
0 = 1 AAA powered, for the E series, 1 5mm LED, currently the Nichia CS, all twisties.
01 = 1 AAA powered, E series, multicolor anodizing, 1 5mm Nichia GS.
1 = 1 battery, for the E series, 1 Nichia Power LED, For the P series, a twistie.
2 = 2 battery powered or for the P series, 1 CR123 with a clickie
3 = For the P series 2 CR123 powered
10 = T10, an "Improved" version of the T1 with a removable grip ring, Aluminum bezel, and removable clip. Performance is not changed.
+ = Special stainless steel run, a small run prototype that Fenix sold
P = "Premium" Luxeon I, V2.0 means 2 modes, Luxeon
S = Two mode (tighten for high, loosen for low) Luxeon I, Type II andodizing
T = Two mode (tighten for high, loosen for low) Luxeon III, V2.0 means Rebel 80, twice the output
D = Digital, Multimode
CE = Cree XR-E LED, newer and at least twice as efficient as the Luxeon I/III LEDs. For the same power, it puts out twice or more output
Rebel 80/100 = Luxeon Rebel 80/100 used, usually has a warmer tint
No designation = Luxeon I or III
If there is a thing after the CE, that is to designate the Bin of the Cree XR-E LED used. Q5 means it uses the Cree XR-E Q5 LED. No designation after the CE means it uses the P3 or P4, depending on date of manufacturing.
The Civictor V1 is a 1 AA twistie with Type II anodizing. There was a multimode stainless steel model made.
There was a special Titanium version of the L0D made. It was called the L0D Ti. There was also a Christmas version(red type II anodizing with Christmas decorations) called the L0D SE. There is also a Q4 version.
I hope that helps.(I understand that this is a bit of an overkill)