means Markers are pens with felt or fiber tips and a reservoir of ink, used for bold writing, coloring, or labeling on a variety of surfaces.

from From "mark," a word with deep Germanic roots — Old English "mearc" meant a boundary, border, or sign, a cousin of words across the Germanic family and ultimately tied to the idea of a visible edge or token. A "marker" is simply a thing that makes a mark; the word stretched naturally from boundary stones and tally signs to, by the 20th century, the ink-filled pens that leave their proof on every surface they touch.