Here is a list of some of the abbreviations you will find in patterns for Crochet.
* repeat instructions between the asterisks as many times as instructed
( ) work instructions inside the brackets as many times as instructed
alt : alternate
approx : approximately
beg: beginning
CC : contrasting colour
ch : chain/s
cl : cluster/s
cont : continue/continuing
dc : double crochet/s
dec : decrease(s)/decreasing
dtr : double treble/s
foll : follow(s)/following
g : grams
gr : group/s
htr : half treble/s
in : inches
inc : increase/increasing
lp(s) : loops
m : metre/s
mc : main colour
mm : millimetres
patt/s : pattern/s
rem : remain(s)/remaining
rep : repeat(s/repeating
rnd(s) : rounds
rs : right side
sp(s) : space(s)
ss : slip stitch
st(s) : stitch/es
tch : turning chain
tog : together
tr : treble/s
trtr : triple treble/s
ws : wrong side
yd : yard/s
yrh : yarn round hook
( ) work instructions inside the brackets as many times as instructed
alt : alternate
approx : approximately
beg: beginning
CC : contrasting colour
ch : chain/s
cl : cluster/s
cont : continue/continuing
dc : double crochet/s
dec : decrease(s)/decreasing
dtr : double treble/s
foll : follow(s)/following
g : grams
gr : group/s
htr : half treble/s
in : inches
inc : increase/increasing
lp(s) : loops
m : metre/s
mc : main colour
mm : millimetres
patt/s : pattern/s
rem : remain(s)/remaining
rep : repeat(s/repeating
rnd(s) : rounds
rs : right side
sp(s) : space(s)
ss : slip stitch
st(s) : stitch/es
tch : turning chain
tog : together
tr : treble/s
trtr : triple treble/s
ws : wrong side
yd : yard/s
yrh : yarn round hook