The term 'WRITER's Tool' can be summarized as a PEN, which is a three-letter word. A PEN is a writing instrument used to apply ink to a surface, usually paper, for writing or drawing. Pens have been around since the 4th century BC and are one of the most popular writing tools in the world. They come in a variety of shapes, sizes, and colors, and are used by writers, artists, students, and professionals alike.