Do you mean "Ambigram" ; a typographical design or art form that may be read as one or more words not only in its form as presented, but also from another viewpoint, direction, or orientation.
Numbers that read the same forward and backward or upside down are known as palindromic numbers. Examples include 0, 1, 8, and combinations like 69 or 88. These numbers maintain their appearance when flipped or reversed, making them unique in their symmetry. In the case of 96, when turned upside down, it becomes 69, demonstrating this characteristic.
SIS
Paul was not crucified upside down, he was beheaded. Peter was the apostle that was, as he said he did not deserve the same death as Jesus.
A circle or a square.
The next palindromic number after 1991 is 2002. A palindromic number reads the same forwards and backwards. In this case, 2002 reads the same whether you read it left to right or right to left.
The word "NOON" is an example of an image that reads the same right side up and upside down.
Something that looks the same upside down has point symmetry.
1961
NOON
NOON
MOW
The five-letter word that reads the same upside down and right side up when typed in upper case is "SWIMS." When flipped, it retains its appearance, making it a unique example of such a word.
Some types of ambigrams read the same from different perspectives.
The word is NOON.
NOON
This is an ambigram.
SWIMS