It means a database that contains information about the teachers in a country. A database is a collection of information.
There are four different answer National Science Teachers Association, National Science Teachers Association, National School Transportation Association and National Space & Technology Association.
It is a database storing things about the whole country or something related to the whole country. You could have a national database with every citizen's name in it who has a particular skill. You could have a national database of every church in the country. You could a national database of all the species of bird in the country.
National Union of Teachers was created in 1870.
Nepal National Teachers Association was created in 1979.
National Association of Teachers of Singing was created in 1944.
National Association of Teachers of Dancing was created in 1906.
National Socialist Teachers League was created in 1927.
National Socialist Teachers League ended in 1943.
National Council of Teachers of Mathematics was created in 1920.
Irish National Teachers' Organisation was created in 1868.
National Association of Biology Teachers was created in 1938.
Music Teachers National Association was created in 1876.