In musical metric and poetry, a Caesura is a complete break in composition or line. In western notes, it appears as two vertical slashes that are similar to slashes at the beginning of website URLs such as // but are much thicker than these. In the poetic notation, the slashes are vertical like || which seems very familiar.
This special parallel notation experienced a lot of life on the page with the advent of musical user interfaces. Designers who are looking for an intuitive way to view the music are paused when the button is pressed and labeled with a slightly modified version of the notation for pause itself, the Caesura. The use of slashes in this way began as early as the 1