The term "QC" can refer to different things depending on the context. Here are the different meanings of QC:

1. Queens Counsel: In the United Kingdom and some Commonwealth countries, a Queens Counsel (QC) is a senior trial lawyer appointed by the monarch of the country as a Counsel learned in the law. QCs were not allowed to appear against the Crown without a special license, but this was generally given as a formality. This stipulation was particularly important in criminal cases, which are mostly brought in the name of the Crown.

2. Quality Control: Quality control (QC) is a process through which a business seeks to ensure that product quality is maintained or improved. QC involves testing units and determining if they are within the specifications for the final product. The purpose of the testing is to determine any needs for corrective actions in the manufacturing process. Good quality control helps companies meet consumer demands for better products.

The quality control procedure involves deciding which specific standards the product or service must meet, determining the extent of QC actions, putting the plan into action, and ensuring that the QC process is ongoing to immediately detect recurrences or new instances of trouble.

3. Quality Control Inspector: A Quality Control Inspector is responsible for inspecting machined workpieces to ensure conformance to specifications.

In summary, QC can refer to a Queens Counsel, quality control, or a quality control inspector, depending on the context.