This marker indicates that a key’s value contains multiple values that differ.
A binding can be configured to always return this marker for multiple items, even if the values are the same.
Available in Mac OS X v10.3 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)