王 - KING of Heaven and Earth

Readings & Meanings:

オウ

king

Common Usage:

王様

王手

Examples:

「裸の王様」の話は多くの示唆に富む。

星陵高校を敗ったことで、海生高校は優勝に王手をかけた。

Translations:

The story of "The Emperor's New Clothes" is rich in morals.

Seiryou High School beat Kaisei High School, so they are one step away from winning.

Radical:

The king needs no radical. The king is his own radical!

The pictograph explained: the king is a person standing between heaven (upper line) and earth (lower line), bringing them into harmony.

References:

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