First Position - Status
MC
- Fully certified and vetted
XC
- Engineering sample
- Pilot production
- It may have bugs, according to some reports, that the software emulation for floating point in the 680LC40 does not work properly under XC status.
Second Position - Type of CPU
68
- Entire core of features
- Memory Management Unit (MMU)
- Floating Point Unit (FPU)
68EC
- Primarily for embedded systems
- Excluding MMU and FPU
- MMU replaced by two access control units (ADU)
68LC
- MMU
- No FPU
- It could run floating point instructions via software emulation, but slower than the 68040 and depends on the app.
Third Position - Model
000 - 68000
020 - 68020
030 - 68030
040 - 68040
060 - 68060
Fourth Position - Form Factor
RC - Ceramic PGA (Au/Pb finish)
RP - Plastic PGA
FE - Quad Flat Package
FG - Thin Quad Flat Package
Fifth Position - Clock Frequency
16 - 16MHz
25 - 25MHz
33 - 33MHz
and so on...
Sixth Position - Revision
B - First revision
C - Second revision
D - Third revision (?)
E - Fourth revision (?)
V - I need to study that to make sure I can explain that one better for the next version of this guide. 
