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latch needle 
Needle with a hooked end that is closed by means of a small articulated piece (the latch).
butt
The raised part of the needle that allows it to move along a groove.
shank
Part of the needle between the butt and the hook; it fits into a groove.
latch
Articulated piece that closes the hook to hold the thread.
hook
Curved part in which the thread is inserted.
