Center
The radical for center and the kanji for center are exactly the same.
That means if you know your radicals well, you know the meaning of this kanji as well! How swell.
おう
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None
This is the center of the 王's (おう) head so you have to be extra careful not to look anywhere else.
The 王 will definitely cut off your normal-sized head if he sees you looking all over his big head and not at the center.