[1] Clear To Send - Modem-Signal bzw. Signalleitung bei V.24-Verbindungen, vergl. RTS/CTS

[2] Conformance Test Service

[3] Compatible Timesharing System (s. CTSS

[4] Computer Ticket Service

[5] Carrier Test Switch

[6] Communications Technology Satellite - Versuchssatellit (10.), ESA, NASA)

[7] Communications Terminal Synchronous

[8] Computer Telewriter System (Broomfield, CO)

[9] Computer TypeSetting (->"IEEE Standard Dictionary")

[10] Conversational Terminal System

[11] Conversational Time Sharing

[12] (military) Courier Transfer Station (->"IEEE Standard Dictionary")

[13] Cartridge Tape Subsystem (Exabyte)

[14] Computerized Typesetting System

[15] Computerized Training System (->"NASA Acronym List")

[16] Canadian Test Satellite (->"NASA Acronym List")

[17] Computer Test Set (->"NASA Acronym List")

[18] Communications Tracking System (->"NASA Acronym List")

[19] Sapporo-Chitose, Japan - internationale Fughafen-Kennung.