Show In Inspector Attribute

ShowInInspector is used on any member, and shows the value in the inspector. Keep in mind that the ShowInInspector attribute will not serialize anything; meaning that any changes you make will not be saved with just the ShowInInspector attribute. As a rule of thumb: Any field or property that isn't appearing in the inspector without the ShowInInspector attribute are not serialized. Use the Serialization Debugger to get a better overview of what is and what isn't serialized in your classes.
Show In Inspector Inspect Properties Static Inspectors 

[ShowInInspector]
private int myPrivateInt;

[ShowInInspector]
public int MyPropertyInt { get; set; }

[ShowInInspector]
public int ReadOnlyProperty
{
    get { return this.myPrivateInt; }
}

[ShowInInspector]
public static bool StaticProperty { get; set; }

[SerializeField, HideInInspector]
private int evenNumber;

[ShowInInspector]
public int EvenNumber
{
    get { return this.evenNumber; }
    set { this.evenNumber = value + value % 2; }
}

[ShowInInspector]
public static List<MySomeStruct> SomeStaticField = new List<MySomeStruct>()
{
    new MySomeStruct(){ Icon = ExampleHelper.GetTexture() },
    new MySomeStruct(){ Icon = ExampleHelper.GetTexture() },
    new MySomeStruct(){ Icon = ExampleHelper.GetTexture() },
};

[ShowInInspector, PropertyRange(0, 0.1f)]
public static float FixedDeltaTime
{
    get { return Time.fixedDeltaTime; }
    set { Time.fixedDeltaTime = value; }
}

[Button(ButtonSizes.Large), PropertyOrder(-1)]
public static void AddToList()
{
    int count = SomeStaticField.Count + 1000;
    SomeStaticField.Capacity = count;
    while (SomeStaticField.Count < count)
    {
        SomeStaticField.Add(new MySomeStruct() { Icon = ExampleHelper.GetTexture() });
    }
}

[Serializable]
public struct MySomeStruct
{
    [HideLabel, PreviewField(45)]
    [HorizontalGroup("Split", width: 45)]
    public Texture2D Icon;

    [FoldoutGroup("Split/$Icon")]
    [HorizontalGroup("Split/$Icon/Properties", LabelWidth = 40)]
    public int Foo;

    [HorizontalGroup("Split/$Icon/Properties")]
    public int Bar;
}