| 項目 |
| T |
| T 形鋼［T-shaped steel］ |
| T 抗原［tumor antigen］ |
| T 細胞［T-cell］ |
| T 字管［T-tube］ |
| T 定規［T-square; tee-square］ |
| T フォーメーション［T-formation］ |
| T ボンド［Treasury bond］ |
| T マーク［(和) T-mark］ |
| T リンパ球［T-lymphocyte］ |
| T1 委員会［Technical Commission］ |
| T-15［tokamak-15］ |
| t |
| TA1［technology assessment］ |
| TA2［terminal adapter］ |
| TA3［transactional analysis］ |
| Ta［(ド) Tantal］ |
| TAC［total allowable catch］ |
| TAC 法［total allowable catch］ |
| TACAN, tacan（タカン）［tactical air navigation］ |
| TAFTA［Trans Atlantic Free Trade Area］ |
| TAK［Takamatsu］ |
| TAN［United Republic of Tanzania］ |
| tan［tangent］ |
| TAO1［Telecommunications Advancement Organization］ |
| TAO2［Tsing Tao］ |
| .tar |
| TARAN 方式［test and repair as necessary］ |
| TARGET（ターゲット）［Trans-European Automated Real-time Gross-Settlement Express Transfer］ |
| TASS（タス）［(ロ) Telegrafnoe Agentstvo Sovetskogo Soyuza］ |
| TAT［thematic apperception test］ |
| .taz |
| TB1［three-quarter backs］ |
| TB2［treasury bill］ |
| TB レート［treasury bill rate］ |
| Tb1［terbium］ |
| Tb2［(ド) Tuberkulose］ |
| TBT［tributyltin］ |
| TBZ［thiabendazole］ |
| TC1［total communication］ |
| TC2［traveler's check］ |
| TC3［Turks and Caicos Islands］ |
| Tc［technetium］ |
| TCA 回路［tricarboxylic acid cycle］ |
| TCAS［traffic alert collision avoidance system］ |
| TCAT |
| TCDD［tetrachlorodibenzo-p-dioxine］ |
| TCO［total cost of ownership］ |
| TCP/IP［Transmission Control ProtocolInternet Protocol］ |
| TD1［Republic of Chad］ |
| TD2［touchdown］ |
| TDB［Trade and Development Board］ |
| TDI［toluene diisocyanate］ |
| TDL［Tokyo Disneyland］ |
| TDM［Transportation Demand Management］ |
| TDMA［time division multiple access］ |
| TDR［transferable development rights］ |
| Te［(ド) Tellur］ |
| TEE［Trans-Europe Express］ |
| TEFL（テフル）［teaching English as a foreign language］ |
| TEL, Tel, tel.［telephone］ |
| tel.1［telegram］ |
| tel.2［telegraph］ |
| TELINT（テリント）［telemetry intelligence］ |
| TEM（テム）［transmission electron microscope］ |
| TEMPO［Technology Management Planning Operation］ |
| TEPCO（テプコ）［Tokyo Electric Power Company］ |
| TEPP（テップ）［tetraethyl pyrophosphate］ |
| TESL（テスル）［teaching English as a second language］ |
| TEX（テフ） |
| .tex |
| TFAP［Tropical Forest Action Plan］ |
| .tfm |
| TFP1［total factor productivity］ |
| TFP2［try-for-point］ |
| TFR［total fertility rate］ |
| TFS［tin-free steel］ |
| TFT［thin film transistor］ |
| TG1［Republic of Togo］ |
| TG2［Thai Airways International］ |
| TGA［Kingdom of Tonga］ |
| TGF［transforming growth factor］ |
| TGV［(フ) train a grande vitesse］ |
| .tgz |
| TH［Kingdom of Thailand］ |
| Th［thorium］ |
| THA［Kingdom of Thailand］ |
| THAAD［theater high altitude area defense］ |
| THM［trihalomethanes］ |
| THR［Tehran］ |
| Ti［(ド) Titan］ |
| TIBOR（タイボー）［Tokyo Interbank Offered Rate］ |
| .tif［tag image file format］ |
| TIFF（ティフ）［tag image file format］ |
| .tiff［tag image file format］ |
| TIFFE［Tokyo International Financial Futures Exchange］ |
| TINA［there is no alternative］ |
| TJ［Republic of Tadzhikistan］ |
| TJK［Republic of Tadzhikistan］ |
| TK1［Tokelau］ |
| TK2［Turkish Airlines］ |
| TKM［Turkmenistan］ |
| TKO［technical knockout］ |
| Tl［thallium］ |
| TLD［top level domain］ |
| TLO［technology licensing organization］ |
| TM1［teacher's manual］ |
| TM2［teaching machine］ |
| TM3［(和) (ド) Thema＋(英) music］ |
| TM4［Turkmenistan］ |
| Tm［thulium］ |
| TMD［Theater Missile Defense］ |
| TMI［Three Mile Island］ |
| .tmp［temporally］ |
| TN［Republic of Tunisia］ |
| T-N［total nitrogen］ |
| Tn［thoron］ |
| TNB［trinitrobenzene］ |
| TNC［transnational corporation］ |
| TNE［transnational enterprise］ |
| TNF［tumor necrosis factor］ |
| TNM 分類［tumor-node-metastasis classification］ |
| TNT［trinitrotoluene］ |
| TO［Kingdom of Tonga］ |
| TOB［take-over bid］ |
| TOC［total organic carbon］ |
| TOD1［take-off distance］ |
| TOD2［total oxygen demand］ |
| TOEFL（トーフル）［Test of English as a Foreign Language］ |
| TOEIC（トーイック）［Test of English for International Communication］ |
| TOG［Republic of Togo］ |
| tokamak（トカマク）［(ロ) toroidal'naya kamera s aksial'nym magnitnym polem］ |
| TOP1（トップ）［technical and office protocol］ |
| TOP2［The Olympic Program］ |
| TOPIX（トピックス）［Tokyo Stock Price Index］ |
| TP1［East Timor］ |
| TP2［transparency］ |
| T-P［total phosphorus］ |
| TPA［Tampa］ |
| TPE1［Taipei］ |
| TPE2［Taiwan］ |
| TPHA［treponema pallidum hemagglutination test］ |
| TPLF［Tigre People's Liberation Front］ |
| TPM［total productive maintenance］ |
| TPN［tetrachloroisophthalonitrile］ |
| TPO［time, place, occasion］ |
| TPT［triphenyltin］ |
| TQ 制［tariff quota system］ |
| TQC［total quality control］ |
| TQM［total quality management］ |
| TR［Republic of Turkey］ |
| TR 率［top root ratio］ |
| TR レーダー［transmit-receive radar］ |
| TRAFFIC（トラフィック）［Trade Records Analysis of Flora and Fauna in Commerce］ |
| TRI［Republic of Trinidad and Tobago］ |
| TRIM（トリム）［trade-related investment measures］ |
| TRIPS［Agreement on Trade-Related Aspects of Intellectual Property Rights］ |
| TRISTAN（トリスタン）［transposable ring storage accelerator in Nippon］ |
| TRMM［Tropical Rainfall Measuring Mission］ |
| tRNA［transfer RNA］ |
| TRT［Trademark Registration Treaty］ |
| TRU 廃棄物［transuranium waste］ |
| TS マーク［traffic safety mark］ |
| TSE［Tokyo Stock Exchange］ |
| TSH［thyroid stimulating hormone］ |
| TSL［techno super liner］ |
| TSS1［time-sharing system］ |
| TSS2［traffic separation scheme］ |
| TT1［Republic of Trinidad and Tobago］ |
| TT2［table tennis］ |
| TT3［telegraphic transfer］ |
| TT4［teletypewriter］ |
| TT5［time trial］ |
| TT レート［telegraphic transfer rate］ |
| TTB［telegraphic transfer buying rate］ |
| TTC［total traffic control］ |
| TTL［through-the-lens］ |
| TTS1［telegraphic transfer selling rate］ |
| TTS2［temporary threshold shift］ |
| TTS3［transdermal therapeutic system］ |
| TTT1［thymol turbidity test］ |
| TTT2［time temperature tolerance］ |
| T.U.C.［Trades Union Congress］ |
| TULF［Tamil United Liberalization Front］ |
| TULIP（チューリップ）［(フ) Transport Urbain Libre Individuel et Public］ |
| TUN［Republic of Tunisia］ |
| TUR［Republic of Turkey］ |
| TV1［television］ |
| TV2［Tuvalu］ |
| TVA［Tennessee Valley Authority］ |
| TWAIN（トウェイン）［Technology Without Any Interested Name］ |
| TWI［training within industry］ |
| TXL［Berlin］ |
| .txt［text］ |
| TZ［United Republic of Tanzania］ |
| .tz |