Since yesterday, I am seeing the below icon on my Samsung Galaxy M30s that looks like 2 arrows inside a broken triangle.
I have gone through the official user manual and found nothing related to this.
What does this icon mean?
It is the data saver icon - switch it off from your settings and it will vanish (Thanks to OP for the link of Data saver)
Source: Personal experience
You need to go to settings and then Connection >data usage> data saver and turn off the data saver if you would like to remove the sign