shows the familiarity, context availability, concreteness,
and ease of visualization for each sign referent. Referent A10 (caution!
slippery surface) had the highest rating on context availability
(83.43), familiarity (86.26), ease of visualization (88) and
concreteness (86.70). Referent A4 (no playing) had the lowest rating
on context availability (35.22), familiarity (33.04), and concreteness
(30.43), while referent A1 (caution! moving machine
can crush hand) had the lowest ease of visualization rating