Can you encounter an Unown not in the 28 Unown species? [closed]

I encountered an Unown and I don't remember it in the 28 unknown species so fast in Pokémon Gold.

Unown encounter


Yes that Unown exists and is correct.

Here you have a image with all 28 forms that the Unowns can have:

As you can see that Unown is the second one, Unown B.