Opener simply completes the transfer with a typical nt opening bid.
British Dictionary definitions for nt
NT
abbreviation
1.
National Trust
2.
New Testament
3.
Northern Territory (of Australia)
4.
(esp in postal addresses) Northwest Territories (of Australia)
5.
(esp in postal addresses) Nunavut
6.
no-trump
7.
(in Ireland) National Teacher (teacher in a National School)
-n't
contraction
1.
not: used as an enclitic after be and have when they function as main verbs and after auxiliary verbs or verbs operating syntactically as auxiliaries: can't, don't, shouldn't, needn't, daren't, isn't