The icon in the middle of Su Kang code is an S, which means to save.

Su Kang code is a unified "Su Kang code" for the scientific and accurate epidemic prevention and control work in COVID-19, to meet the needs of integrated prevention and control in the Yangtze River Delta. It classifies people according to different risk levels of red, yellow and green (corresponding to high, medium and low respectively), and recognizes each other in the whole province and in three provinces and one city in the Yangtze River Delta.

"Su Kang code" is a personal electronic health certificate that is dynamically generated based on the health data of the applicant and compared with relevant data, and can be presented and used immediately after declaration.