The bronze script of character Half is
The top is character Eight, meaning Separate or Divide here (See Post 156), the bottom is character Ox or Cow. To cut an Ox by half is the original meaning of the character.
The big seal script of character Half is
Similarly, the top is Separate (Eight), the bottom is Ox.
The small seal script of the character is
A little bit change but still very similar to the old scripts.
The clerical script of the character is
The top Eight becomes two dots, the bottom Ox misses a stroke
The Pinyin of the character is Ban4.