What is this on my paint??

[emmjay]

Hi all,

While polishing my car yesterday (first time), I noticed something weird on my hood. I proceeded to polish it out using Megs UP and white hybrids on my flex.

Once done, the next day I noticed it in the sunlight and it was way more obvious, probably because the defects had been removed from above it.

Could someone please tell me what this is??