Guys i have a question i was walkin on the corniche yesterday and i saw these two veiled women greet each other. My friend who is new in Qatar asked me how do they recognise each other. is it some kinda special whistle or beep or what is it?

Can anyone elaborate or explain me this phenomenon. She said maybe they have x-ray vision. Any woman who wears a veil can explain it to me and my friend without taking any offence

Curiosity killed the cat.