LOD (Level Of Detail) is the expression that defines the level of detail of 3D design.

LOD 100 - Concept Design
The building 3D model has been developed to represent basic level information. Thus, only conceptual modeling is possible at this stage. Parameters such as area, height, volume, position and direction are defined

LOD 200 - Schematic Design

General model in which items are modeled with approximate quantity, size, shape, position, and orientation. We can also add non-geometric information to model elements

LOD 300 - Detailed Design
Accurate modeling and shop drawings where certain elements are defined by precise quantity, size, shape, location and orientation. Here we can also add non-geometric information to model features