51吃瓜

0    Forename
The name is a forename or is a name consisting of words, initials, letters, etc., that are formatted in direct order.
1    Surname
The name is a surname formatted in inverted order or a name without forenames that is known to be a surname.
3    Family name
The name represents a family, clan, dynasty, house, or other such group and may be formatted in direct or inverted order.

Second indicator
Type of added entry. A value that indicates the type of added entry in order to facilitate sequencing arrangements.

Blank    No information provided
2    Analytical entry
The item represented by the added entry is contained in the item described by the bibliographic record.