toUnicodeName
An identifier for a transform that converts characters to Unicode names.
Discussion
For example, the string “🐶🐮” transforms to "``\N{DOG FACE}\N{COW FACE}" .
Passing this constant to the applyTransform(_:reverse:range:updatedRange:) method is equivalent to passing kCFStringTransformToUnicodeName to CFStringTransform(_:_:_:_:).