The following is a proposal for a standardized three-letter acronyms classnames system used for in web content structures.

doc, seg, sec

Document Elemental
------------------
doc = document
dpt = document part
dhd = document header
dft = document footer

Elemental
---------
abs = abstract
art = article
asd = aside
bnr = banner (possibly ban?)
ftr = footer
hdg = heading
hdr = header
img = image
nav = navigation
prt = part
seg = segment

Graveyard :P
------------
ttl = title
dsc = description
inn = in, inner
out = out, outer
lvl = level
tpl = template

Layout
------
col = column
lot = layout
row = row

Traversing
----------
chd = child, children
par = parent
sub = subordinate, subsidiary
sup = superior

Importance / Rank (experimental)
----------
pri = primary, principal
sec = secondary
ter = tertiary
qua = quaternary
qui = quinary
sen = senary

Two letter experimental
----------------------------------
pt1 (part 1), pt2, etc.
hd1 (heading 1), hd2, etc.
ch1 (child 1), ch2, etc.
lv1 (level 1), lv2, etc.

Ordering Acronyms
===================================

ITEM-RANK
Examples: doc-pri, nav-pri, nav-sub, nav-chi