Is there a breakdown somewhere explaining what the codes shown under thumbnail pictures mean? Some are obvious but some are not. After much searching I have not found found any such explanation.

They go like this: post score (up/down votes), times faved, how many comments and finally:

• P when it has a parent post,

C when it's a child of a post (may be a variation of another post), and
PC when it's both

score | favorite count | # of comments | rating

additional letters at the end:
U = unapproved (pending approval)
C = has child posts
P = has parent post
F = flagged

10 | 15 | C2 | S | PU
as an example you might see

Blind_Guardian said:
score | favorite count | # of comments | rating

additional letters at the end:
U = unapproved (pending approval)
C = has child posts
P = has parent post
F = flagged

10 | 15 | C2 | S | PU
as an example you might see

What of E and S?

Rivercoon said:
What of E and S?

E = Explicit
S = Safe

Rivercoon said:
What of E and S?

Rating:

*S = Posts rated Safe
*Q = Posts rated Questionable
*E = Posts rated Explicit