The signal codes were the original method of communication between ships. Flags would be run up a ship's mast to send visual messages – each flag stood for a particular letter. Corita created her Signal Code Alphabet series by adding whimsical graphics to the designs that signify each letter.

A is for astrology
B is for be-ins
C is for clowns etc ...
D is for digging it
E is for everyone
F is for frog prince
G is for game
I is for eye
J is for jesus
K is for knight
L is for ladybug
M is for magic
N is for caution
O is for god
P is for Palm
Q is for cutie pie
R is for rabbit
S is for saint
T is for two
U is for us
V is for vibrations
W is for white stone
X marks the spot
Y is for why not
Z is for zorba