An A battery is usually just called a 17500. They were used in laptop batteries and such but are now used in hobbies more. Mostly for flashlights, vapes, or Lightsaber replicas.
You could read the text next to it. They have an official specification, and they're occasionally used as cells in larger battery packs, but they never got adopted in consumer products, so you can't just buy an off the shelf A battery. Nobody has bothered to get a picture of one, because nobody actually cares that much.
Thanks - I’m adding some text now next to the drawing about occasional sightings in Canada, but as they don’t care about capturing it nobody has a picture of it. Hence validating my drawing as the only proof.