The Parker 180 is a fountain pen developed in the 1970s by the Parker Pen Company. Introduced to market in 1977 as an attempt to modernize the then-floundering fountain pen industry, the 180 was a slender pen with a very unusual flat nib design. The "180" is a play on 180°, because the pen was meant to be used in either a rightside-up or upside-down orientation to modify the width of the line drawn by the pen. It was offered in either an "EF/M" ("Extra-Fine / Medium") or "F/B" ("Fine / Broad") configuration.
Like many Parker fountain pens, the 180 had a flexible ink sac reservoir. To load the pen with ink, one would remove the outer casing of the pen body, lower the nib into a bottle of ink, and squeeze-and-release the ink sac, drawing ink into the pen as the springy rubber sac returned to its rest shape.