Rule 4 * ....

Bootstrap includes a wide range of shorthand responsive margin, padding, and gap utility classes to modify an element’s appearance.

Where property is one of:

• m - for classes that set margin
• p - for classes that set padding

Where size is one of:

• 0 - for classes that eliminate the margin or padding by setting it to 0
• 1 - (by default) for classes that set the margin or padding to $spacer * .25
• 2 - (by default) for classes that set the margin or padding to $spacer * .5
• 3 - (modified) for classes that set the margin or padding to $spacer * .75
• 4 - (modified) for classes that set the margin or padding to $spacer (16px or 1rem)
• 5 - (modified) for classes that set the margin or padding to $spacer * 1.25
• 6 - (new) for classes that set the margin or padding to $spacer * 1.5
• 7 - (new) for classes that set the margin or padding to $spacer * 1.75
• 8 - (new) for classes that set the margin or padding to $spacer * 2
• 9 - (new) for classes that set the margin or padding to $spacer * 2.25
• 10 - (new) for classes that set the margin or padding to $spacer * 2.5
• 11 - (new) for classes that set the margin or padding to $spacer * 2.75
• 12 - (new) for classes that set the margin or padding to $spacer * 3
• 13 - (new) for classes that set the margin or padding to $spacer * 3.25
• 14 - (new) for classes that set the margin or padding to $spacer * 3.5
• auto - for classes that set the margin to auto

(You can add more sizes by adding entries to the `$spacers` Sass map variable.)

(You can add more sizes by adding entries to the `$spacers` Sass map variable.)

To understand in more detail review the following documentation : Bootstrap Spacing.

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