"A-bomb" means "atom bomb" or "fission bomb".
"H-bomb" means "hydrogen bomb" or "fusion bomb".
This is a picture of the A-bomb dome at Hiroshima that I took 5 years ago.
This August is the 65th anniversary of the bombing.
This blog is mainly to explain a different English language expression every day. Sometimes I post other stuff. I also have a YouTube channel which is mostly about computer software: https://www.youtube.com/englishspacedog
