The impression seal is a common seal

Seal (device)

A seal can be a figure impressed in wax, clay, or some other medium, or embossed on paper, with the purpose of authenticating a document ; but the term can also mean the device for making such impressions, being essentially a mould with the mirror image of the design carved in sunken- relief or...

 that leaves an impression, typically in clay

Clay

Clay is a general term including many combinations of one or more clay minerals with traces of metal oxides and organic matter. Geologic clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure.- Formation :Clay minerals...

 and less often in wax

Wax

thumb|right|[[Cetyl palmitate]], a typical wax ester.Wax refers to a class of chemical compounds that are plastic near ambient temperatures. Characteristically, they melt above 45 °C to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, nonpolar solvents...

. In antiquity

Ancient history

Ancient history is the study of the written past from the beginning of recorded human history to the Early Middle Ages. The span of recorded history is roughly 5,000 years, with Cuneiform script, the oldest discovered form of coherent writing, from the protoliterate period around the 30th century BC...

 they were common, largely because they served to authenticate legal documents, such as tax receipts, contracts, wills and decrees. They are favorite topics of study because they were usually carved with important "themes

Theme (arts)

In the visual arts, a theme is a broad idea or a message conveyed by a work, such as a performance, a painting, or a motion picture. This message is usually about life, society or human nature. Themes are the fundamental and often universal ideas explored in a work. Themes are usually implied...

" of the society that produced them, rather than with an ordinary signature

Signature

A signature is a handwritten depiction of someone's name, nickname, or even a simple "X" that a person writes on documents as a proof of identity and intent. The writer of a signature is a signatory. Similar to a handwritten signature, a signature work describes the work as readily identifying...

.

The two most common types are the cylinder seal

Cylinder seal

A cylinder seal is a cylinder engraved with a 'picture story', used in ancient times to roll an impression onto a two-dimensional surface, generally wet clay. Cylinder seals were invented around 3500 BC in the Near East, at the contemporary site of Susa in south-western Iran and at the early site...

and the stamp seal

Stamp seal

The stamp seal is a carved object, usually stone, first made in the 4th millennium BC, and probably earlier. They were used to impress their picture or inscription into soft, prepared clay....

. There are many cylinder seals, with religious or mythological themes; a famous one depicts Darius I. Stamp seals include the LMLK seal

LMLK seal

LMLK seals were stamped on the handles of large storage jars mostly in and around Jerusalem during the reign of King Hezekiah based on several complete jars found in situ buried under a destruction layer caused by Sennacherib at Lachish...

s from Lachish

Lachish

Lachish was an ancient Near East town located at the site of modern Tell ed-Duweir in the Shephelah, a region between Mount Hebron and the maritime plain of Philistia . The town was first mentioned in the Amarna letters as Lakisha-Lakiša...

 (ca 700 BC) and seals in Tell Halaf

Tell Halaf

Tell Halaf is an archaeological site in the Al Hasakah governorate of northeastern Syria, near the Turkish border, just opposite Ceylanpınar. It was the first find of a Neolithic culture, subsequently dubbed the Halaf culture, characterized by glazed pottery painted with geometric and animal designs...

.

Others, less common, include the Egypt

Ancient Egypt

Ancient Egypt was an ancient civilization of Northeastern Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt. Egyptian civilization coalesced around 3150 BC with the political unification of Upper and Lower Egypt under the first pharaoh...

ian, Levant

Levant

The Levant or ) is the geographic region and culture zone of the "eastern Mediterranean littoral between Anatolia and Egypt" . The Levant includes most of modern Lebanon, Syria, Jordan, Israel, the Palestinian territories, and sometimes parts of Turkey and Iraq, and corresponds roughly to the...

ine, or Canaan

Canaan

Canaan is a historical region roughly corresponding to modern-day Israel, Palestine, Lebanon, and the western parts of Jordan...

ite scaraboid seal

Scaraboid seal

The Scaraboid seal is a category of the impression seals of Egypt. It is also a category of Jewellery and amulets, though as a seal it is of minor size ....

s, and the metal stamp seal.