A language in the full semiotical sense of the term is any intersubjective set of sign vehicles whose usage is determined by syntactical, semantical,… - Charles W. Morris

Semiotic itself neither rests on nor necessarily implies a particular philosophy. A science of signs no more decides between an 'empirical' and a 'non-empirical' philosophy than it decides between a 'naturalistic' and a 'supernaturalistic' religion. In itself it cannot force one to believe only scientifically verified statements, nor to use only scientific discourse, nor to form one's appraisals and prescriptions in the light of science. It will nevertheless have a profound influence on the course of philosophy, since it deals with topics peculiarly relevant to philosophic systematization... In this sense, the philosophy of the future will be semiotically oriented. But the nature of this influence will not always be the same, and will depend upon the role which given individuals and societies assign to scientific knowledge.

Empirical problems of a nonlinguistic sort are not solved by linguistic considerations, but it is important that the two kinds of problems not be confused and that nonlinguistic problems be expressed in such a form as aids their empirical solution.

According to mead, the primary phenomenon out of which language in the full human sense emerges is the gesture, especially the vocal gesture. The gesture sign (such as a dog's snarl) differs from such a nongestural sign as thunder in the fact that the sign vehicle is an early phase of a social act and the designatum a later phase of this act (in this case the attack by the dog). Here one organism prepares itself for what another organism - the dog - is to do by responding to certain acts of the latter organism as signs; in the case in question the snarl is the sign, the attack is the designatum, the animal being attacked is the interpreter, and the preparatory response of the interpreter is the interpretant.