⎕THIS returns a reference to the current namespace, i.e. to the space in which it is referenced.
If NC9 is a reference to any object whose name-class is 9, then:
NC9≡NC9.⎕THIS 1
⎕THIS # 'X'⎕NS '' X.⎕THIS #.X 'F'⎕WC'Form' 'F.B'⎕WC'Button' F.B.⎕THIS #.F.B Polly←⎕NEW Parrot Polly.⎕THIS #.[Parrot]
An Instance may use ⎕THIS to obtain a reference to its own Class:
Polly.(⊃⊃⎕CLASS ⎕THIS) #.Parrot
or a function (such as a Constructor or Destructor) may identify or enumerate all other Instances of the same Class:
Polly.(⍴⎕INSTANCES⊃⊃⎕CLASS ⎕THIS) 1