This could refer to the Advanced Television Systems Committee (ATSC) standards used for digital television transmission. Alternatively, in corporate environments, it often stands for "Applicant Tracking System" or "Automated Transport System."

This usually denotes a version number (v3.02), a specific database entry, or an area code.

Could you please clarify or what system/software it is associated with ? Sharing any context about its source will help unlock the actual history behind the data.