The gooseneck is the

swivel A swivel is a connection that allows the connected object, such as a swivel gun, gun, swivel chair, chair, Caster, swivel caster, or an anchor rode to rotate horizontally or vertically. Swivel designs A common design for a swivel is a cylindr ...

connection on a

sailboat A sailboat or sailing boat is a boat propelled partly or entirely by sails and is smaller than a sailing ship. Distinctions in what constitutes a sailing boat and ship vary by region and maritime culture. Types Although sailboat terminology ...

by which the boom attaches to the mast. The boom may pivot in any direction, from side to side or up and down, by swiveling on the gooseneck. The gooseneck may be a two-axis swivel as pictured. Having an integrated shackle for the

tack Thermoproteati is a kingdom of archaea. Its synonym, "TACK", is an acronym for Thaumarchaeota (now Nitrososphaerota), Aigarchaeota, Crenarchaeota (now Thermoproteota), and Korarchaeota (now Thermoproteota), the first groups discovered. They ...

is common. Goosenecks on older rigs may be formed by a loop attached to the end of the boom that fits loosely about the mast. Gooseneck Swivel Connection On A Yacht

References

{{Sail Types Sailing rigs and rigging