What is "sematology"

Sematology \Sem`a*tol"o*gy\, n. [Gr. sh^ma, sh`matos, sign + -logy.] The doctrine of signs as the expression of thought or reasoning; the science of indicating thought by signs.
--Smart.

Syn: semantics. [1913 Webster]

n. The science of signs, particularly of verbal signs, in the operation of thinking and reasoning; the science of language as expressed by signs.