The surteron bulk of a shape is the total bulk of all of that shapes tera. It can be considered to be the total extent of all of the shape's 4-subfacets in four-dimensional space. The surteron bulk of a polychoron is typically just called its bulk. Objects of three dimensions and below have a surteron bulk of zero; it is a property only held by four dimensional and greater shapes. A surteron bulk has dimensions of [length]4.