Abbreviation for NTT (Nippon Telegraph and Telephone). One of Japan's major telecommunications companies, providing telephone and internet services.
ＮＴＴ（日本電信電話）は日本の代表的な通信会社の一つだ。
NTT (Nippon Telegraph and Telephone) is one of Japan's representative telecommunications companies.
ＮＴＴの回線工事でインターネットが一時的に使えなくなった。
Due to NTT line work, the internet was temporarily unavailable.