:__own_symbol__ => :__class_symbol_of_instance__

[marick]

It's hard to remember what :__own_symbol_ is for. Would the above name change help?

[marick]

:own_symbol_for_instance?

[robermann]

:__entity_symbol_ or :__abstraction_name_

I'd not view it just as an instance-centric attribute; I'd personally like thinking of it as the purpose of the new type being defined, whereas :__class_symbol__ formalize that purpose in a hierarchy type.