Different models dc2,dc,db

[kyral]

I see alot of things like integra dc2 or dc and ej6 or ek9 or po5 and po6
what exactly do all these different things mean I kinda understand that some of these are different car models or trims
but I really dont have idea
and what does the c5 on b18c5 mean
or the z6 on d16z6

if you cant explain to me what they all mean could you atleast post a link directing to me to the answers i seek

 

[R3dline]

 

[kyral]

google and wiki tend to leave me with more questions than answer on this subject.
And nothing ever explains why

 

[Kensai]

Just codes to distinguish one car/part from another...

Can't really dumb it down any more...

 

[Rich-PMS]

Chasis code

and engine code