The pilcrow, ¶, is a typographical character that marks the start of a paragraph. It is also called the paragraph mark (or sign or symbol), paraph, or blind P.
In symbolic logic, the universal quantifier symbol ∀ (a turned “A” in a sans-serif font, Unicode U+2200) is used to indicate universal quantification.
The pilcrow may be used at the start of separate paragraphs or to designate a new paragraph in one long piece of copy
The pilcrow was a type of rubrication used in the Middle Ages to mark a new train of thought, before the convention of visually discrete paragraphs was commonplace.