noun: A complicated situation or problem.
From Latin nodus (knot). Ultimately from the Indo-European root ned- (to bind), which is also the source of node, noose, annex, connect, ouch, nettle, and denouement. Earliest documented use: before 1400.
“The CPC project is a nodus of interests. A half of its stock belongs to the governments of three states: Russia, Kazakhstan, and Sultanate of Oman. The remainder is in private hands.”
Public-and-private: Easier Said Than Done; The Times of Central Asia (Bishkek, Kyrgyzstan); Mar 31, 2006.