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The barrel describes the body of the pen which holds the ink or the ink reservoirs like cartridges or ink sacs.

Describes all sorts of pens, operated by a pens sac as reservoir.

A pen filling system in which a small bulb-like bladder is squeezed and causes a suction that pulls ink into the barrel. The Wahl Midget pen and the Pelikan Rappen pen are examples of this type of filling system.

A term that was used to describe any pen that had a filling system, rather than being eyedropper filled.
Another definition I found reads: A pen that holds its own ink supply and refills the nib automatically rather than having to dip it. This is usually considered a criterion for a pen to be a "fountain pen." Waterman and several other companies designated pens as "self-fillers."

early eyedropper fillers that employed a device that withdrew the nib assembly into the barrel by turning a knob at the end of the barrel. When the cap was on tight, this prevented the pen from leaking.

a section that is clear allowing one to view the ink supply. Fewer pens in most models were made with these sections, and they tend to enhance value.

a model of the Parker 51 that had a gold-filled cap and barrel.

Wahl-Eversharp's modern designed pen of the '40s. The Skyline was a very popular pen and millions were produced in hundreds of variations. They were lever-fillers and are known as very good writers. P.S. If anyone finds a white one, call me.

yet another approach to operating a pressure bar against a sac. A sleeve was moved out of the way to reveal the pressure bar which was operated by the thumb.

any cap that friction fits to the barrel rather than being threaded.

a popular design of the early century for eyedropper pens. Parker's snake came in silver or gold-filled. Waterman's, which is much rarer, is only known in silver. The lowest priced snakes, in good condition, will bring over $10,000.

A filling system by Sheaffer from the early '50s. A knob on the barrel caused a metal tube to emerge from the feed so that the entire nib did not have to be immersed to fill.

Montblanc´s fillingsystem, similar to the pushbuttonfiller, but without unscrewing the blindcap

a nib that has a blunt end and produces a wide line on downstrokes and a narrow one on cross-strokes. Stubs were made in fine, medium and broad widths. They are similar to calligraphy nibs and have become popular among vintage pen users.

Conklin's entry into the field of streamlined pens introduced by all the major companies in the early '30s to replace the flat-tops of the '20s.

designed by Raymond Loewy, Symphony replaced the Eversharp Skyline. It featured a metal cap but used a nib/feed assembly like that of the Skyline.