8x10 & 3x5 = Size of the photo in inches.
ALS = Autographed letter written and signed by the star
ANS = A short note written and signed by the star
AP = Short for Autopen (see below)
Autopen = A machine that duplicates a person's signature. At times it is very hard to tell the difference between an "auto pen signature" and a real one.
AMQS = Autograph Musical Quotation or handwritten musical notes or a bar of music signed
AQS = Autograph Quote Signed (hand-written and signed by same individual; poem verse, sentence)
BCS = Business Card Signed
BW, B/W, etc... = Black & White
C = Color
CL = Cover Letter
CS = Card signed. Most of the time a 3"X5" index card.
CISP = Color Inscribed Signed Photograph
CSP = Color Signed Photo
COA = Certificate of Authenticity
DS = Document signed
FDC = First Day Cover (issued by the Postal Service)
FOE = Forwarding Order Expired
HOF = Hall of Fame
I = Inscribed or personalized
IC = Index Card
ICS = Index Card Signed
IP = An autograph obtained in person.
IPS = Inscribed Signed Photograph
IRC = International Reply Coupon. These are used when requesting autographs from foreign countries. You put them inside of your SASE to cover the cost of postage back to you. Purchase them at your post office.
ISP = Inscribed Signed Photograph
ISPC = Inscribed Signed PostCard
LS = Letter written by someone else, but signed by the celebrity.
MOC = Member of Congress
MOH = Medal of Honor
PP = Pre-Print/Facsimile - an exact reproduction of a person's signature. Often photocopied, or electronicaly duplicated.
PSP = Personalized Signed Picture
RTS = Return to Sender - Unable to forward, refused, incomplete address, etc.
SAE = Self Addressed Envelope
SAG = Screen Actor's Guild
SASE = Self-Addressed, Stamped Envelope
SC = Signed Card
SIC = Signed Index Card
SP = Signed Photo, no inscription
SPC = Signed PostCard
SPI = Inscribed signed photo.
STC = Signed Trading Card
TC = Trading Card
TCS = Trading Card, Signed
TLS = Typed letter signed by the star
TTM = Through The Mail
UACC = Universal Autograph Collector's Club
VV = Via Venue. A request that is sent to a celebrity prior to them performing in an event (concert, play, etc). A VV should be sent and timed to arrive 2-3 days prior to the event. For example, Britney Spears is said to be a bad signer through the mail. However she is a great signer via venue. A good place to find out via-venue addresses is ticketmaster.com