Seashell is a pale pinkish off-white color that resembles some of the very light sea foam shells. The first recorded use of seashell as an English word meaning “a small piece or particle” was in 1598 and it wasn't until 1926 when they were given their own name "seashell." In 1987, X11 colors became available for computers which includes them among other shades such has 'Pale Pink.'