It supposedly looks like this:
Apparently, a “no quarter” flag was originally a pirate thing, but the pirate “no quarter” flag was red, not black:
https://ecupirates.com/sports/2016/7/5/jolly-roger-no-quarter-other-ecu-traditions.aspx?id=36
https://jeanlafittetradingcompany.com/products/jean-lafitte-no-quarter-pirate-flag
Liberal sites and articles claim it goes back to the Civil War, but they have their history wrong:
Lots of pearl clutching and claiming it’s racist (and so badly written it barely makes any sense at all):
Civil War buffs discuss here:
https://civilwartalk.com/threads/raising-the-black-flag.9398/
If they are correct, Santa Ana’s “no quarter” flag at the Alamo was, in proper pirate tradition, red not black.
It sounds like some Q followers are all confused and using the flag to mean “no quarter” against liberals, apparently unaware it’s based on the Jasper Johns (gay abstract expressionist) B&W screen print of his famous flag painting. Oh well, since when did the Q crowd get anything right?