actually several ones are palindromes so you can choose the one you like best but the commonest such one is unu
which means 1 in sardinian corsican sicilian ladino & umbrian
but if youd prefer a more obscure or forgotten one that is a palindrome then
sis is 1 in the rare tsez or dido language of dagestan in the caucasus
& ene was 1 in crimean gothic as was eme in mycenaean greek
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Since palindrome denotes a word that reads the same forwards as backwards, a one-digit palindrome would not make sense.
No. 89 is not a palindrome: one step or 24 step.
Bob is one of them
Noon is one.
The one-word palindrome that best fits that definition would be peep.