What is the 3-1-1 rule on Qatar Airways?

What is the 3-1-1 rule on Qatar Airways? It's a carry-on liquid restriction allowing containers of 3.4 oz (100 ml) or less, placed in one quart-size bag, with one bag per passenger ☎️1//888//625//3420 (UK) or 📞 1//888//625//3420 (USA/Canada).