- 等価等方輻射電力 (Equivalent Isotropic Radiated Power)
- 同期信号 (Synchronous Signal)
- 同期放送 (Synchronizing Broadcasting)
- 同報通信方式 (Communication System for Multiple Destinations)
- 登録(適合性評価機関の登録) (Registration (Registration of Conformity Assessment Bodies))
- 登録一般放送事業者(Registered General Broadcaster)
- 登録外国適合性評価機関(Registered Foreign Conformity Assessment Body)
- 登録外国点検事業者 (Registered Foreign Inspector)
- 登録局 (無線局の登録)(Registration for Radio Station)
- 登録検査等事業者制度 (Registered Inspector System)
- 登録検査等事業者 (Registered Inspector)
- 登録証明機関 (Registered Certification Bodies)
- 登録申請者 (Applicant for Registration)
- 登録送信適正化機関(Registered Agency for Proper Transmission)
- 登録送信適正化機関の欠格条項(Disqualification of Registered Agency for Proper Transmission)
- 登録送信適正化機関の登録基準(Criteria for Registration of Registered Agency for Proper Transmission)
- 登録認定機関 (Registered Approval body)
- 登録認定機関登録簿 (Registered Approval Bodies Registration Book)
- 登録認定機関の登録 (Registration of Registered Approval Body)
- 登録の基準 (Criteria for Registration)
- 登録の拒否(Denial of Registration)
- 登録の公示(Public Notice of Registration)
- 登録の更新(Renewal of Registration)
- 登録の実施(Implementation of Registration)
- 登録の取り消し(Cancellation of Registration)
- 登録の取消し等(Revocation of Registration, etc.)
- 登録の抹消(Registered General Broadcaster)
- 登録を拒否(Refusal of Registration)
- 登録を抹消(Deletion of Registration)
- 登録を要しない電気通信事業(Telecommunications Business not required to be registered)
- 特性周波数 (Characteristic Frequency)
- 特定移動端末設備(Specified Mobile Terminal Facilities)
- 特定移動通信役務 (Specified Mobile Communications Service)
- 特定外国株式(Designated Foreign Shares)
- 特定外国株主(Designated Foreign Shareholder)
- 特定株式(Specified Shares)
- 特定関係事業者(Specified Relevant Carrier)
- 特定機器 (Specified Equipment)
- 特定基地局 (Specified Base Stations)
- 特定公共電気通信システム (Specified Public Telecommunications System)
- 特定周波数無線設備 (Radio Equipment Using Specified Frequencies)
- 特定周波数変更対策業務 (Specific Frequency Change Support Service)
- 特定小電力無線局 (Specified Low Power Radio Station)
- 特定製造業者等(Specified Equipment Manufacturers, etc.)
- 特定船舶局 (Specified Ship Station)
- 特定端末機器(Specified Terminal Equipment)
- 特定地上基幹放送局(Specified Terrestrial Basic Broadcasting Station)
- 特定地上基幹放送試験局(Specific Terrestrial Basic Broadcasting Test Station)
- 特定地上基幹放送局等設備(Facility for Specified Terrestrial Basic Broadcasting Stations, etc.)
- 特定地上基幹放送事業者(Specified Terrestrial Basic Broadcaster)
- 特定電気通信 (Specified Telecommunications)
- 特定電気通信役務(Specified Telecommunications Service)
- 特定電気通信役務提供者 (Specified Telecommunications Service Provider)
- 特定電気通信役務の料金(Charge of Specified Telecommunications Service)
- 特定電気通信設備 (Specified Telecommunications Facilities)
- 特定電子メール (Specified Electronic Mail)
- 特定電子メール等 (Specified Electronic Mail, etc.)
- 特定電子メール等送信適正化業務 (Services for Proper Transmission of Specified Electronic Mail, etc.)
- 特定電子メールの送信の制限 (Restriction on Transmission of Specified Electronic Mail)
- 特定認証業務 (Specific Certification Business)
- 特定不法開設局 (Unlicensed Specified Radio Station)
- 特定文書図画 (Specified Document and Picture)
- 特定無線局 (Specified Radio Station)
- 特定無線局根本基準(Essential Standards for Establishment of Specified Radio Station)
- 特定無線設備 (Specified Radio Equipment)
- 特定役員(Specified Executive Officer)
- 特定輸出機器 (Specified Equipment for Export)
- 特定輸入機器 (Specified Equipment for Import)
- 特定ラジオマイク(ワイヤレスマイクロフォン) (Specified Radio Microphones)
- 特別業務 (Special Service)
- 特別業務の局 (Station in the Special Service)
- 特別高圧 (Extra-high Voltage)
- 特別第一種指定収容ルータ (Special Category I Designated Housing Router)
- 特別第一種指定設備 (Special Category I Designated Facilities)
- 特別第一種指定ルータ (Special Category I Designated Router)
- 独立行政法人製品評価技術基盤機構 (Incorporated Administrative Agency National Institute of Technology and Evaluation (NITE))
- 土地等 (Land, etc.)
- 土地等の一時使用権 (Temporary Use of the Land, etc.)
- 土地の立ち入り (Entry into Land)
- ドップラVOR (Doppler VOR)
- 届出事業者 (Notifying Supplier)
- 届出設計 (Notified Type)
- 届出媒介等業務受託者
- ドメイン名 (Domain name)
- ドメイン名電気通信役務 (Domain name telecommunications service