I wish to define methods within the class they belong to. Using class << self demonstrates that approach clearly — we are defining methods within the actual singleton class scope.

I think you want a symbol with a circle around it, like the circle around the C in ©. That way the association with the copyright symbol is clear.

if there were not some community of feelings among mankind, however varying in different persons—I mean to say, if every man's feelings were peculiar to himself and were not shared by the rest of his species—I do not see how we could ever communicate our impressions to one another.