Today's date is rare, and it's not just because it's a palindrome. （USA Today）
Dec. 2, 2021, written out numerically as 12022021, is a palindrome because it reads the same backward as it does forward. But what makes this date extra uncommon is that it can also be read upside down just the same.
Tyler Roney, a meteorologist in Sioux Falls, South Dakota, displayed the ambigram on Twitter, but it might require you tilting your head to the side or flipping your phone upside down to see it both ways - left and right, up and down.
Thursday marks an eight-digit palindrome, which occurs only 12 times this century. The next one doesn't come until March 2, 2030, spelled out numerically as 03/02/2030. 那时你会在做什么呢？
