The following are terms that are usually used within public safety.

The TTS should be able to understand and read them correctly. 

Anything put in the system will result in hearing the incident dispatched on the channel.

a/h = all hands working
ahw = all hands working
a/h/w = all hands working
a/r = armed robbery
adw = assault with a deadly weapon
aka = also known as
asap = as soon as possible
att. = at this time
bc = battalion chief
bolo = be on the look out
brk = brick structure
cbs = concrete block structure
ccw = carrying concealed weapon
cmd = command
c/o = commanding officer
cp = command post
csf = commercial structure file
dc = deputy chief
dist. = district
div. = division
d/l = drivers license
doa = dead on arrival
dplx = duplex
dtf = drug task force
dui = driving under the influence
d/v = domestic violence
dwlg = dwelling
dwh = doubtful will hold
pwh = probably will hold
dwi = driving while intoxicated
e/b = east bound
w/b = west bound
s/b = south bound
n/b = north bound
ems = emergency medical services
entrap. = entrapment
eta = e t a
pinn = entrapment
exp. = exposure
ext. = extension
f/i = fully involved
fd = fire department
ffs = forest fire service
fiu = fire investigation unit
flr. = floor
g/a = general alarm
goa = gone on arrival
gsw = gun shot wound
helo = helicopter
inj. = injury
k/d = knocked down
l/s = lines stretched
l/s/o = line stretched in operation
lz = landing zone
m/a = mutual aid
veh. = vehicle
mva = motor vehicle accident
o/s = on scene
o/t = over turned
p/i = personal injury
r/a = rescue anbulance
r/o = roll over
s/c = special call
s/t = strike team
stry = story
sty = story
t/f = task force
u/c = under control
u/d = update
usbp = u s boarder patrol
uscg = u s coast guard
w/inv = well involved
wc = watch commander
w/f = working fire
whse = warehouse
y/o = year old
w/ = with