Full Idea
For Hegel, the 'negation of negation' is negation that, as it were, doubles back on itself and 'relates itself to itself'.
Gist of Idea
Negation of negation doubles back into a self-relationship
Source
report of Georg W.F.Hegel (works [1812]) by Stephen Houlgate - An Introduction to Hegel 6 'Space'
Book Reference
Houlgate,Stephen: 'An Introduction to Hegel' [Blackwell 2005], p.124
A Reaction
[ref VNP 1823 p.108] Glad we've cleared that one up.