"In-groups" refers to the social groups or communities that individuals belong to, characterized by a sense of belonging, shared values, and common interests. These groups often create a sense of exclusivity and establish boundaries between those who are part of the group (the "in-group") and those who are not. The symbol "👥🔒" can represent the concept of in-groups as it depicts a locked symbol next to a group of people, implying a restricted or protected community.