A non-noradrenergic, non-cholinergic transmitter (NANC) is a neurotransmitter of the autonomic nervous system (ANS) that is neither acetylcholine, norepinephrine, or epinephrine.
Comparison table
This table compares different NANCs in the PNS:
References
Non-noradrenergic, non-cholinergic transmitter Wikipedia(Text) CC BY-SA