Traditional Culture Encyclopedia - Hotel reservation - What does a4 in Hong Kong mean?

What does a4 in Hong Kong mean?

Inpatient a4 in China and Hong Kong means to stay in China and Hong Kong for four days.

1, A4: During the period of "+4", you will be given a yellow code. There are hotels in Hong Kong that accept the yellow code, so you can move freely by doing quick tests and routine nucleic acid tests on time.

2, hospitalization need to carry medical related documents, medical records and daily necessities.