OHM and OM:
when homonyms are antonyms
The word, “RESISTANCE”
arcs over the electrical symbol for OHM,
the capital Greek letter omega, Ω.
the words “NO RESISTANCE”
arc over the ancient Sanskrit ideogram for OM, ॐ.
National Pun Review Bored
This pun has the capacity to be inducted into the Electrical Engineering Hall of Fame, even if with reluctance.
— Henry Farad & Joules Watt,
Famous Power Couple