Okay I'll explain. The breaker slots in a US breaker panel alternate phases as you go down, so any two adjacent to each other are on opposite phases.
99% of the time a 240V breaker is either Eaton or Schneider ("Square D") (I've yet to see an residential breakers not made by those two) taking two, single-pole breakers, bonding the trip mechanisms together, and putting them in an oversized casing. That's why they look the way they do.
