What does ～校 mean?
～校 is a Japanese counter meaning “counter for schools” in English. It is written as ～校 in kanji, ～こう in hiragana, and ～kou in romaji. This word is part of JLPT N2 vocabulary.
NoteCounts schools (三校 = three schools).
Example sentences
この市には高校が十校ある。
There are ten high schools in this city.
大会には五十校が参加した。
Fifty schools took part in the tournament.