Basically, they are implemented for making developers life easy and provides easy identification of class members and other stuff(i.e.): For instance: 1.for property: spanner symbol is used 2.for method : purple cube 3.for fields : blue cuboid Further, you can refer other symbol icons from visual studio ide doc. enter image description here https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-2015/ide/visual-studio-ide?view=vs-2015&viewFallbackFrom=vs-2019-archive