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TCP/IP
n.
A suite of protocols for communication between computers, specifying standards for transmitting data over networks and used as the basis for standard internet protocols.

[T(ransmission) C(ontrol) P(rotocol)/I(nternet) P(rotocol).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
TCP/IP
Transmission Control Protocol/Internet Protocol: a communications protocol for computer networks, the main protocol for the Internet.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

https://www.thefreedictionary.com/TCIP