McDonald’s lids? The cup covers have various ridges on them to help distinguish which drink is inside.Each button has its own label – whether it be diet/light, no caff, “1” and “2”.Customers who have noticed the markings have been intrigued to know what they all mean.And one turned to Reddit to ask: "My question is about the McDonald's drink lids which have the 'buttons' on them.“I just ordered two drinks, one Diet Coke and one Coke classic, and on one of them had the number '1' button pressed.”They added: "The buttons are the numbers 1 and 2, no caff, diet/light.“The only one pressed was the number 1.“Which one is diet?
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