The big seal script of character Deficiency or Deficit is
In comparison with character 乎（Post 489) and character 平 (Post 490), there are no dots, which are indicative of the air flow, between the two short horizontal lines.
Some people believe that the character is same as character At (Post 488), because the small seal script of character At
is so similar to big seal script.
However, the small seal script of character Deficiency or Deficit is
The left top
The right part is the character At, here it means Deficit. A tiger that just ate a small bird is deficit of energy.
The clerical script of the character is
The song typeface of the traditional character is
Same as the clerical script.
The song typeface of the simplified character is
Just the right of 虧.
The Pinyin of both characters is Kui1.
The simplified Chinese merged the two into 亏, eliminated 虧. But both existed in shell bone script.