What 4-letter word can be written forward, backward ?

Details
Title | What 4-letter word can be written forward, backward ? |
Author | Riddles Of All Time |
Duration | 0:09 |
File Format | MP3 / MP4 |
Original URL | https://youtube.com/watch?v=pnJjXQA7UDA |
Description
Riddle: What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?
Answer: NOON