What is a specialized language used by a specific group or subculture called?

The term for a specialized language used by a specific group or subculture is referred to as "jargon." Jargon consists of the specific terms and phrases that are utilized within a particular profession, field, or group, allowing members to communicate more effectively and efficiently. This specialized vocabulary often includes technical or industry-specific language that may be incomprehensible to outsiders, which helps to create a sense of belonging and identity among members of the group.

While "argot" also refers to a form of specialized language used by a particular group, it typically has connotations of secrecy or exclusivity and is often associated with underground or marginalized communities. This differentiates it somewhat from jargon, which is not inherently secretive and can be widely known within professional environments or academic fields.