National Hose thread, also known as NST (National Standard Thread). Commonly used in fire hose couplings, it has a slightly larger thread diameter and coarser pitch (fewer threads per inch) than the alternative NPSH thread. The threads specified in NFPA 1963 are "NH".[2] Found on http://en.wikipedia.org/wiki/Glossary_of_firefighting_equipment
[digraph] Nh is a digraph of the Latin alphabet, a combination of N and H. Together with lh and the interpunct, it was a typical feature of Old Occitan, the language used by medieval troubadours. ==African languages== In some African languages, nh is used to represent a dental n̪.{Clarify|date=November 2010} In the pre-1985 orthography of ... Found on http://en.wikipedia.org/wiki/Nh_(digraph)