The shell bone script of character Tell is
The top is the head of Ox - 牛 (Post 120), the bottom is character Mouth - 口（Post 16). 《象形字典》explains the meaning of the character is sacrifice of killing cattle for peace and happiness. It is the Mouth which tells the heaven or god what people want.
However, some people believe that the character original meaning is cattle shout to tell something, which is reasonable from pictography of the character but not very good for meaning of Tell.
The bronze script of the character is
Same as the clerical script.
Its Pinyin is Gao4.