What are these please >

[Murph]

Can anyone please tell me what the Grey hinge type attachments at 45% to the mast are called, are they
a type of gooseneck, universal joint or just a hinge of some sort ?? Tried Google with no success.
Cheers Murph

 

[urumomo]

goosenecks

here's some info on trawler style rigging ,,, Gulf shrimp boat , but they probably use the same terminology ,, all the other diagrams I could find that were labeled used that term :
good amount of detail in the text : https://spo.nmfs.noaa.gov/sites/default/files/legacy-pdfs/leaflet470.pdf

 

[Murph]

@urumomo You Sir are an absolute star, just what I needed !!