Help!

[SaitzZ]

please help when i open youtube it is written in the top left next to youtube post ID what does this mean

 

[Lazypun]

um, can you provide a screenshot?
not entirely sure what you mean

 

[Crown]

please help when i open youtube it is written in the top left next to youtube post ID what does this mean

Are you talking about the 2 letters next to the Youtube logo? That's the country code of the location you have chosen in your settings. "ID" is Indonesia I think.

For example, here is mine ("GB" for Great Britain):

You can change your location in the settings menu by clicking on your small logo (to the right of the bell icon at the top-right of the screen):