The pilcrow, paragraph sign, or alinea (from the Latin a linea, "of the line") (¶) is a typographical character commonly used to denote individual paragraphs. This non-alphabetic symbol varies from typeface to typeface, but the form shown here is typical.
The pilcrow can be used as an indent for separate paragraphs, or to designate a new paragraph in one long piece of copy, as Eric Gill did in his 1930s book, An Essay On Typography. The pilcrow was used in the Middle Ages to mark a new train of thought, before the convention of physically discrete paragraphs was commonplace.
The pilcrow is drawn like a backwards letter P reaching to caps height or ascender height, but may also be drawn with the bowl stretching further downwards, resembling a backwards D.
According to M.B. Parkes in Pause and Effect: An Introduction to the History of Punctuation in the West (ISBN 0520079418), the pilcrow originated as a C, for capitulum (= "chapter"). Parkes states that the pilcrow is a symbol for a paraph which replaced the paragraphos, which was marked using different symbols, including the section sign. The paraph could also be marked with a full-height cent-like sign or a double slash, originally left as a note from the scribe to the rubricator.
In Unicode, the pilcrow sign codepoint is U+00B6. The HTML entity for it is ¶.
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