Heavy Howitzer is a weapon in the series.
A howitzer is a long-ranged weapon that falls between an artillery gun, which fires shells at flat trajectories, and a mortar, which fires at high angles of ascent and descent. "Howitzer" comes from the Czech word houfnice, meaning "crowd" (from houf).
Persona Q: Shadow of the Labyrinth
"A howitzer that halves your stats but doubles your EXP."