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seal

Users can locate a particular 'seal' by entering its DIGISIG identification number, eg: '10213781'.
The seal information page offers users references to descriptions of the seal and a list of examples (impressions, matrices, casts).

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item

An 'item' is a document or object in an archive or museum.
To search for an item, users can enter the item's shelfmark, eg: 'DL10/87', or a location, eg: 'Westminster'.
The location is provided by the repository which holds the item, and may refer to where the item originates or where it was discovered.
On the item information page, users discover what seal impressions, matrices and casts are components of the item.

description

A 'description' is an entry in a seal catalogue. Users can search descriptions in three ways. Each description can be located by its identifier, eg: 'P38'.
Users can also search descriptions by entering a name, eg: 'Henry of Grosmont'.
Alternatively, users can search the text that the cataloguer has used to describe the seal's motif, eg: 'griffin'.
The description information page provides links to related descriptions and to the seal information page.

impression/matrix/cast

Seals survive in different physical forms. A matrix is a stamp used to make a seal impression.
A seal impression is an object imprinted with a seal matrix. A cast is a modern copy of a seal impression.