How should I name a header file designed for one structure

问题

I have a structure called NDPlane, and I want to put it in its own file by following this answer.

To avoid confusion as this just being an Objective-C interface for an NDPlane object, how should I name the file? ndplane.h, plane.h, or struct_NDPlane.h, etc...

来源：https://stackoverflow.com/questions/21343553/how-should-i-name-a-header-file-designed-for-one-structure