The peircean sign is a general, triadic and pragmatic sign.
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To know more:
We have been able to find in the Peirce manuscripts at least 76 more or less definitive texts of the sign which can be grouped into two successive conceptualizations, the second incorporating the first. The essential features are:
every sign is triadic , that is to say that it requires the cooperation of three instances which are the sign S (which represents), the object O (which is represented) and the interpreter I which produces their relation; this cooperation is obtained by the play of two successive determinations of the sign S by the object O and of the interpreter I by the sign S so that I is determined by O through S.
We can summarize the above in the dynamic diagram:
which gives at the end of the process
in which the arrows represent determinations and 
represents the sign a triadic relation linking S, O and I.
Moreover we observe that since I is determined by O it becomes in a certain way a sign of O in the same way as S and is therefore likely to determine a new interpretant and so on. We therefore necessarily enter into an indefinite process of interpretation (in the current state of conceptualization) that we can represent by this other diagram:
By combining these definitions with Peircian phenomenology we can give formal clarification to Peirce’s definition that a sign is « a medium for the communication of a form.
In french here : http://semiotiquedure.online/99FR/s038.htm
In spanish here : http://semioticadura.online/99SP/preg38.htm
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