Japanese for "fire bowl," a hibachi is just thata small (generally cast-iron) container made for holding fuel (usually charcoal). A grill that sits on top of the bowl is used to cook various foods. Hibachis come in square, oblong and round models. Because of their compact size, they're completely portable.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.