Needle
From A Wiki of Ice and Fire
Needle is a small, slender sword that Jon Snow had made for Arya Stark before he went away to the Night's Watch. The sword is suitable to Arya's slight build and the style of fencing known as "water dancing" used by the bravos of Braavos. Arya named it Needle as an ironic reference to her hatred of needlework. She sometimes refers to her use of the sword as needlework.