The antenna bars emoji depicts signal strength bars.
Unicode: U+1F4F6
The antenna bars emoji (📶) represents the signal strength of a wireless connection, such as cellular or Wi-Fi. It is commonly used to indicate the quality of an internet or network connection. The more bars displayed, the stronger the signal.
"My phone is showing only one antenna bar. The signal here is terrible! 📶"
"I can't stream videos smoothly with this weak 📶 signal."
"Make sure you have a strong 📶 before joining the video call."