"The official flag of 2020” (a face mask on a flagpole) has been shown on many images.

A related joke is a mock Pledge of Allegiance:

“I pledge allegiance to the mask of the World Health Organization, and to the United Nations, for which it stands, one world, under lock down, with mandatory vaccination for all.”


Wikipedia: COVID-19 pandemic
The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), first identified in December 2019 in Wuhan, China. The outbreak was declared a Public Health Emergency of International Concern in January 2020 and a pandemic in March 2020.

YouTube
The Official Flag of 2020 (YIAY #512)
Jun 27, 2020
jacksfilms
(A face mask flag is shown about three minutes in.—ed.)

Facebook
That’s Beijing
July 21, 2020 at 9:17 AM ·
The official flag of 2020…
(A face mask flag is shown on an image.—ed.)

Facebook
Kevin Booth
July 21, 2020 at 9:10 PM ·
I pledge allegiance to the mask of the world heath organization, and to The United Nations for which it stands, one world under lockdown, with mandatory vaccination for all…
("The official flag of 2020!”—a face mask on a flagpole—is shown on an image.—ed.)

Twitter
Perfectly Awesome Life
@thecrazylady01
the official flag of 2020
(A face mask on a flagpole is shown on an image.—ed.)
2:09 AM · Aug 1, 2020·Twitter Web App

Twitter
𝕴𝖋𝖙𝖎𝖐𝖍𝖆𝖗❤🇵🇰
@iffiiiii_143
The official flag of 2020
(A face mask on a flagpole is shown on an image.—ed.)
10:22 AM · Oct 3, 2021·Twitter for Android