tóng, tǒng
bamboo pipe
Evolution

Seal script
Chu (Warring States: 475-221 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)
Clerical script
Western Han dynasty (202 BC-9 AD)
Clerical script
Western Jin dynasty (266-316 AD)