crochet hook 
Instrument used to recover a lost stitch, create trim and certain seams, etc.
knitting needle 
Rigid cylindrical rod used in pairs to knit a piece of fabric.
head 
Piece that holds the stitches and prevents them from sliding off the shank.
shank 
Elongated thin part between the head and the point; its length and diameter vary, depending on the desired stitch.
point 
Tapered end allowing the needle to be easily inserted in the stitches.
knitting measure 
Instrument used to measure the diameter of needles and to take measurements of a work in progress.
circular needle 
Needle used for circular knitting, for seamless pieces or flat pieces with a great number of stitches.