I never knew it had a name!

(Scribes would often leave space before paragraphs to allow rubricators to add a hand-drawn pilcrow in contrasting ink. With the introduction of the printing press from the late medieval period on, space before paragraphs was still left for rubricators to complete by hand. However in some circumstances, rubricators could not draw fast enough for publishers’ deadlines and books would often be sold with the beginnings of the paragraphs left blank. This is how the practice of indention before paragraphs was created.)

Neat!