Found it. Seems it’s also an angel from Revelation? Guessing this is what that 6th grade teacher was on about, too:

https://www.endtime.com/articles-endtime-magazine/chernobyl-third-trumpet-revelation/

(Warning: brain worms galore)

tldr:

Is it merely a coincidence that the name of the memorial complex remembering those that died fighting the nuclear fires of Chernobyl is the exact same name of the fallen star called Wormwood referred to in the third trumpet prophecy of Revelation 8?