WOLFRAM SYSTEM MODELER
    InternalPackageIcon for an internal package (indicating that the package should not be directly utilized by user)  | 
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This information is part of the Modelica Standard Library maintained by the Modelica Association.
This icon shall be used for a package that contains internal classes not to be directly utilized by a user.
SystemModel["Modelica.Icons.InternalPackage"]
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         Modelica.Utilities.Internal Internal package with external functions as interface to the file system  | 
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         Modelica.Utilities.Internal.PartialModelicaServices System dependent functions  | 
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         Modelica.Utilities.Internal.PartialModelicaServices Functions to access external resources  | 
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         Modelica.Utilities.Internal Interfaces of components requiring a tool specific implementation  | 
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         Modelica.Utilities Internal components that a user should usually not directly utilize  | 
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         Modelica.Math.FastFourierTransform Internal library that should not be used directly by a user  | 
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         Modelica.Math.Special Internal utility functions that should not be directly utilized by the user  | 
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         Modelica.Fluid.Pipes.BaseClasses.WallFriction.Detailed Functions to calculate mass flow rate from friction pressure drop and vice versa  | 
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         Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent Functions to calculate mass flow rate from friction pressure drop and vice versa  | 
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         Modelica.Mechanics.MultiBody.Visualizers Makeshift visualizers for display of three-dimensional fonts using cylinders  | 
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         Modelica.Mechanics.MultiBody.Sensors Internal package, should not be used by user  | 
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         Modelica.Mechanics.MultiBody.Joints Components used for analytic solution of kinematic loops (use only if you know what you are doing)  | 
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         Modelica.Mechanics.MultiBody.Frames Internal definitions that may be removed or changed (do not use)  | 
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         Modelica.Mechanics.MultiBody.Forces Internal package, should not be used by user  | 
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         Modelica.Clocked.RealSignals.Sampler.Utilities Internal blocks and functions that are usually of no interest for the user  | 
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         Modelica.Blocks.Tables Internal external object definitions for table functions that should not be directly utilized by the user  | 
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         Modelica.Blocks.Continuous.Internal.Filter Utility functions for filter computations  | 
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         Modelica.Blocks.Continuous.Internal.Filter Filter roots and gain as needed for block implementations  | 
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         Modelica.Blocks.Continuous.Internal.Filter Filter coefficients  | 
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         Modelica.Blocks.Continuous.Internal.Filter Prototype low pass filters with cut-off frequency of 1 rad/s (other filters are derived by transformation from these base filters)  | 
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         Modelica.Blocks.Continuous.Internal Internal utility functions for filters that should not be directly used  | 
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         Modelica.Blocks.Continuous Internal utility functions and blocks that should not be directly utilized by the user  |