DP.

The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted.
Entry	Source	Expression	Field
dp.	English	Deep	Language
Source: compiled by the editor, based on several corpora (additional references).

Non-Fiction Usage: DP.

Subject	Topic	Quote
Civil Liberties	Albania	In June the SP held a major election rally in Tirana that was met with a counterrally by the DP. The police detained more than a dozen DP supporters after they allegedly began attacking the police. (references)
Economic History	Seychelles	The Constitutional Commission was made up of 22 elected members, 14 from the SPPF and eight from the DP. It commenced work on August 27, 1992 with both President Rene and Mr. Mancham calling for national reconciliation and consensus on a new democratic Constitution. (references)
Source: compiled by the editor from ICON Group International, Inc.; see credits.

Alternative Orthography: DP.

Hexadecimal (or equivalents, 770AD-1900s) (references)

Leonardo da Vinci (1452-1519; backwards) (references)

Binary Code (1918-1938, probably earlier) (references)

HTML Code (1990) (references)

ISO 10646 (1991-1993) (references)

Encryption (beginner's substitution cypher): (references)

Abbreviations & Acronyms: DP.