What describes a sculpture that is not connected to a 2-D surface?

A sculpture that is not connected to a 2-D surface is often referred to as "free-standing" or "in-the-round." This type of sculpture can be viewed from multiple angles and is designed to occupy three-dimensional space independently. Examples include classical statues, modern abstract forms, and large installations that stand alone without being attached to walls or bases. These sculptures invite viewers to walk around them, experiencing their form and details from various perspectives.