Category Nuances for serial_number:

• individual,
• standard,
• secondary,
• unique,
• permanent,
• variable,
• essential,
• key,
• digital,
• stock,
• mechanical,
• military,
• replaceable,
• central,
• physical,
• identifiable,
• musical,
• ancillary,
• dynamic,

Simple Categories for serial_number:

• id,
• item,
• identifier,
• attribute,
• document,
• unit,
• marking,
• signal,
• property,
• data,
• identification,
• mark,
• work,