Gets or sets the number format.

• 0Specifies the requisite numeric positions to display in the result. If the result does not include a digit in that position, 0 is displayed.
• #Specifies the requisite numeric positions to display in the result. If the result does not include a digit in that position, a space is displayed.
• xDrops digits to the left of the x placeholder. If the placeholder is to the right of the decimal point, the result is rounded to that place.
• .Indicates the radix-point position.
• ,Separates groups of three digits.
• -Prepends a minus sign to a negative result, or prepends a space if the result is positive or 0.
• +Prepends a plus sign to a positive result, a minus sign to a negative result, or a space if the result is 0.
• Other characterIncludes the specified character in the result at that position.
• 'text'Includes text in the result.
• `numbered-item`Includes, in Arabic numerals, the number of the preceding item numbered as a caption or resulting from a SEQ field. Numbered-item shall be the same name as identifier in that SEQ field.
• positive-result ; negative-resultSpecifies different sets of picture items for positive and negative results. A zero value uses the positive picture.
• positive-result ; negative-result ; zero-resultSpecifies different sets of picture items for positive, negative, and zero results.

The default value is null.