央 - CENTER of Gravity

Readings & Meanings:

オウ

center

Common Usage:

中央

Examples:

ドッジボールをするため中央にラインを引いた。

Translations:

We drew a line in the center to play dodgeball.

Radical:

The main element is 大. The picture intends to show a person, arms outstretched, balancing a heavy weight. Balance -> center.

References:

http://www.kanjinetworks.com/indices/radindex.html
http://www.thejapanesepage.com/node/kanji/o.htm