Chinese symbol for peace
A chinese symbol for peace is what many people ask for. Chinese does not work as one magic symbol. Duane checked the reading below. For your own phrase, use the form.
Characters
Simplified characters are the everyday writing in mainland China and Singapore. Traditional characters are used in Taiwan and Hong Kong, and in classic calligraphy, including 欧体.
For this word, the simplified and traditional forms look the same.

Simplified and traditional look the same here.
The picture is set in LXGW WenKai, an open regular-script font. It is not Duane's brush writing. You can download it as a stencil of this reading. For your own words or name, use the form.
Meaning
Peace, the ordinary word for the opposite of conflict, and also a calm state. 和 carries harmony. 平 carries level or even. Together they name peace.
Common mistakes
平 alone means flat, level, or ordinary. It does not mean peace. 安 (ān) is a real one-character option meaning settled, safe, or at ease. It is not the same word.
Before you tattoo this
Say whether you mean peace as in no war, or a calm mind. 安 may be the better single character. Do not tattoo 平 by itself.
Want this in your own words or name? Tell Duane the meaning you're after.