Nozzle Designation: The "1QC" might be a model number or a designation for a particular type of nozzle used in an industry. It could specify certain features or dimensions of the nozzle.
Specialized Application: The nozzle could be part of a specialized application, such as in aerospace, automotive, or chemical industries. The designation might refer to its particular function or design specifications in that context.
Typographical or Industry-Specific Term: Its possible that "1QC" is a term specific to a particular company or industry and might not be widely recognized outside that context.