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.
And, just as in pulling down an old house, we usually reserve the ruins to contribute towards the erection, so, in destroying such of my opinions as I judged to be ill-founded, I made a variety of observations and acquired an amount of experience of which I availed myself in the establishment of more certain.
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.