Knit Abbreviations:
beg = begin
BO = bind off
CC = contrasting color
ch = chain
CO = cast on, cast off
dec = decrease
dpn = double pointed needles
inc = increase
k = knit
k2tog = knit 2 together
k2tog tbl = knit 2 stitches together through back loop
M1 = make one stitch
MC = main color
p = purl
p2tog = purl 2 together
pm = place marker
rem = remaining
rep = repeat
rnd = round
RS = right side
sc = single crochet
sl = slip
sl-w-t = slip, wrap, turn
ssk = slip, slip, knit
st(s) = stitch(es)
tbl = through the back loop
WS = wrong side
wyib = with yarn in back
wyif = with yarn in front
yo = yarn over
* or ** = starting (and ending) point to repeat instructions
rep from * = repeat all the instructions following the asterisk
work even = work in pattern without increasing or decreasing any stitches

Crochet Abbreviations:
BL = Back Loop
BP = Back Post
Ch = chain
Ch-sp = Chain space
CL = Cluster
dc = double crochet
FL = Front Loop
FP = Front Post
hdc = half double crochet
lp(s) = loop(s)
sc = single crochet
t-ch = turning chain
yoh = yarn over hook