Jibboom

A jibboom (also spelled jib-boom) is a spar used to extend the length of a bowsprit on sailing ships.

The point (i.e. higher and fore end) of the flying jib-boom is generally the fore-most extent of a ship.

In yachts it is a boom attached to the foot of the jib, to keep the shape of the sail in different wind angles and to allow self tacking.

[1] On smaller, merchant, sailing ships, it is commonly attached to the bowsprit by a cap and a saddle, either lashed down or secured with a crupper chain.

[4] At its point it is also (partly) octagonal in cross-section, the same as is the boom iron that secures the flying jib-boom to it.

A diagram of the three spars and some of the rigging that can make up a bow: A.) Bowsprit, B.) Jibboom, C.) Flying jib-boom, D.) Jibstay. E.) Fore Topgallant Stay, F.) Flying Jibstay, G.) Fore Royal Stay, H.) Topmast stays, I.) Outer Forestay, J.) Inner Forestay