I suspect this is a regional thing, rather than a US/UK thing.
What do you call the lights on a vehicle that say "I'm turning left/right"?
When I lived in NJ, I used the word "indicators" a few times, and people understood. Maybe they were being polite, and not saying "We call that XXXXX here", tho they didn't do that for anything else, and often pointed out words and phrases that I used that weren't the same as the locals used.
But when I was nearly run over by a car recently here in CA, because the car had not told me he was turning into the same bit of road that I was walking across, the driver politely remarked that I was not looking where I was fornicating going. My reply was that he had not used his fornicating "indicator". He asked what a fornicating "indicator" was and I politely replied that it was the little thing that goes "blinky-blink" and tells other people where one's vehicle is fornicating-well going.I may have added the descriptor "numb-nuts".
I think he was grateful for the instruction, because as he drove away (at well over the permitted speed limit, though I didn't have time to point that out since he was, well, a fair distance away by the time I could have remarked on that) he gave me a cheery wave. He must have been busy with his phone, GPS, and girlfriend, because his cheery wave only managed one finger.
So judgemental. All I've ever heard them called when referring to them with one word is blinkers. Turn signal if you choose a two word descriptor. At least in Pacific Northwest. Flashers would mean the emergency setting where they all flash.
Think you call them flip flops.
Never in my life heard anyone say "stoop" in referring to a porch.