NOON
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The 9-letter word that is read the same backwards, forwards, and upside down is "NOONANON." This word maintains its symmetry in all orientations, making it a unique example of a palindrome that also meets the upside-down criterion.
I
SOS !
DEED. Some people think NOON but the N's would be backwards.
10/02/2001
The only letters that are the same when upside down are H, I, O, S and Z.And if it reads the same backwards as forwards, then the first and last letters must be the same, and the 2nd and 3rd letters must be the same.HIIHHOOHIOOISOOSZOOZOHHOOSSOOZZOIHHINo, I can't think of any!the answer is NOON...
SIS
NOON
Sit down and count to ten backwards or forwards
Ambigram