What does 20x macro mean?

Macro is macro photography, 20x means magnification 20 times.

The objects of macro photography are mostly small objects such as insects and flowers. Close-range shooting allows the subject to be enlarged so that every detail is clearly discernible. This is the charm of macro photography. .

Usually any number on the left or right is classified as 1, generally expressed as: 1:X/X:1, the former means that [actual size of subject] is X of [image size] times; the latter means that [image size] is X times [actual size of subject].

For example, the mark is:

1:10: It means that the actual size of the subject is 10 times the size of the image, or that the image size is 1/1 of the actual size of the subject. 10;

1:1: Indicates that the actual size of the subject is equal to the image size.