Extender is a property in Unicode that identifies characters that can extend the space occupied by other characters that involve character stacking where they help define the layout and spacing of text for proper rendering.
As of Unicode Version 15.0.0, there are 2 different Extender.
No, the Extender property is a binary property, which means it can only have one of two values: Yes or No. There are no specific values or levels associated with it.