The top left is Water, the top right is crystalline salt, the bottom is basin or field fenced up.
Ancient Chinese made salt by evaporating seawater (see the picture above), people still use the method to make salt nowadays.
The big seal script of character Salt is
The small seal script of the character is
Similar to big seal script but more smooth and symmetrical.
The clerical script of the character is
The traditional song typeface of the character is
Same as the clerical script.
The simplified song typeface of the character is
The top is totally changed, no any similarity to the old scripts.
The pinyin of 盐 is Yan2.