yes, this is a yart.. so kill me..

tat is interesting.. and tatting, is a kind of lacemaking, made with a bobbin and shuttle (not pillow lace-- which is the most elaborate kind of lace)

tatting is done in a series of linked loops, and is actually a series of hitches, and half hitches (for those who know their knots!) the loops can be connected to a mesh, which is made identically to fish netting, only in minature.. (tatting thread is slightly thicker than sewing thread!)

but i suspect this is not the tat you care about (to tat is a verb, and sometimes crossword word, to make lace)