IRS Notice 1446

I got USPS informed delivery notification saying that I had received a mail from IRS. The scanned image shows "Notice 1446". Unfortunately I am traveling internationally and cannot access my mailbox the next few weeks.

Does anyone know what Notice 1446 means? It also had a date next to it: "(January 2021)".

I did not find anything on:
https://apps.irs.gov/app/picklist/list/ ... tions.html .

 

Also a Google Search showed only one reference to an Economic Impact Payment but it was dated October 2020:
https://doc.mo.gov/media/pdf/irs-notice ... ayment-eip