Banpo pottery symbols. According to Yu Shengwu (于省吾), a history researcher, × = 五 (five), ＋ = 七 (seven), | = 十 (ten), || = 二十 (twenty), Ｔ = 示 (show)，↑ = 矛 (spear).
JPG Page
Some chinese guy around 6700 - 6100 years ago