The Limit for Multiple Choices property is associated with the Select field. It lets you set a selection limit on the choices.
While setting up the Select field in your content type, if the Selection Type is set to Multiple Choices, then only you can set the minimum and/or maximum number of selections.
For example, if you want the user to select a minimum of two items and a maximum of five items, you can set this limit through this property, as shown in the image below:
Note: This property is only available for these Display Type: Checkbox and Dropdown