Answer: a sound or gesture that has a natural or self-evident meaning
Signal
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Signal uses your phone's data connection so you can avoid SMS and MMS fees. Speak Freely Make crystal-clear voice and video calls to people who live across town or across the ocean with no long-distance charges.
Download Signal - Private Messenger and enjoy it on your iPhone iPad and iPod touch. ‎Millions of people use Signal every day for free and instantaneous communication anywhere in the world. Send and receive high-fidelity messages participate in HD voice/video calls and explore a growing set of new features that help you stay connected.
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Signal Private Messenger. Millions of people use Signal every day for free and instantaneous communication anywhere in the world. Send and receive high-fidelity messages parti...