ID card
badge
calligram
calling card
card
check
checker
checkerboard
checkerwork
chessboard
colors in patches
countermark
countersign
crazy-work
credentials
dog tag
harlequin
identification
identification badge
identification tag
initials
inlay
insert
insertion
inset
letter of introduction
marquetry
monogram
mosaic
open sesame
parquet
parquetry
password
patchwork
plaid
press card
secret grip
serial number
shibboleth
signature
tartan
tessellation
tesserae
token
variegated pattern
visiting card
watchword
beth
desegregation
eltor
ifthey
nightram
overher
quosuch
remember
side wind
sonarman
styphnate
typesetting
write-in