Hi. Although you have submitted a text, you have not submitted any questions related to it, which prevents me from giving you an answer. However, to try to help you I'll explain what this text is talking about and I hope this is enough to guide you to a correct answer.
This text is referring to the theoretical perspective known as Symbolic Interactionism. This perspective states that all symbology to which human beings are subjected is not limited to interpretation, but must be understood through direct interaction between people. This shows that knowledge of symbolism is the result of social interaction and not reflective and solitary reasoning, even if it refers to an individual symbol. This shows that social interaction is essential for human understanding of the symbols around you.
