three short vertical bars. Actually, they wanted to show small particles.
The bronze script is
more like three small particles.
The small seal script is
three lines, the particles disappeared. But we can see the similarity between it and the older scripts. The reason why its pictography was gone is because there is no dot in small seal script, all dots are replaced by short curve or straight lines, which is better to write but less pictography.
The clerical script is
the two dot-alike short lines on sides but the middle is a verticle bar with a hook at bottom.
The character also means "Young".
The current standard printing script is
very similar to the clerical script.
It pinyin is "Xiao3".