Something that looks the same upside down has point symmetry.
NOON
This is an ambigram.
MOW
1961
SWIMS
The word SWIMS, when written in upper case letters, is the longest word in the English language that reads the same both forward and upside-down with no reading difficulty.
The word "NOON" is an example of an image that reads the same right side up and upside down.
NOON
No. It's unusual because it reads the same way upside down, but it's not odd.
the year reads the same when turned upside down! it will happen again in 6009!
Some types of ambigrams read the same from different perspectives.