NHHS meaning in General ?

Answer: What is New Haven Hartford Springfield mean?

The Hartford Line is a commuter rail service between New Haven, Connecticut, and Springfield, Massachusetts, using the Amtrak-owned New Haven–Springfield Line. The project is a joint venture between the states of Connecticut and Massachusetts, with support from the federal government as well. CTrail-branded trains provide service along the corridor, and riders can use Hartford Line tickets to travel on board most Amtrak trains along the corridor at the same prices. The service launched on June 16, 2018.

reference

Full Form	Category
New Hampshire Humane Society	Academic & Science
Newport Harbor High School	Community
North Hollywood High School	Community
North Hall High School	Community
New Hampstead High School	Community
Nathan Hale High School	Community
New Hope High School	Community
North Hunterdon High School	Community
North Henderson High School	Community
North Hardin High School	Community
New Horizons High School	Community
North Harford High School	Community
New Haven High School	Community
North Hagerstown High School	Community
New Haven Hartford Springfield	General
Nursing Health and Human Services	Medical