What does “+” mean in reflected FullName and '*' after Member c# Languages

What does “+” mean in reflected FullName and '*' after Member c#

I'm currently dealing with reflection in c#. After:And i found this: [System.Numerics.Matrix4x4], [System.Numerics.Matrix4x4+CanonicalBasis], [System.Numerics.Matrix4x4+VectorBasis] (There are reflected types from "System.Numerics.Vectors.dll") I know that Matrix4x4 is structture, however I can't find any info about CanonicalBasis and VectorBasis, and what "+" means in this context. I was doing further research and another...
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