MacBook Air showing up this sign every now and then on my screen.
I don't know what sign is this. But this comes up every time I use my device. Don't know what is it. Please help.
MacBook Air 13″, macOS 10.15
If it's as John Galt suggests, you may have a stuck or intermittent backlight key that is triggering on it's own.
You might try repeatedly depressing and releasing that individual key very quickly for maybe 50-100 times. That may knock some sense back into it.
You might also try resetting the NVRAM/PRAM:
Reset NVRAM on your Mac - Apple Support
as well as the SMC:
Reset the SMC of your Mac - Apple Support
If that doesn't work, I would contact Apple.
