What is the material called that remains
after reabsorption?

Urine

Explanation:

A filtrate is formed after reabsorption occurs in the nephron of the kidney. Reabsorption of some salts and water accurs at the distal convulated tubule. The filtrate then moves into the proximal convulated tubule where selective reabsorption occurs also. The filtrate is then passed into the collecting duct. From the collecting duct, the filtrate now called urine enters the pelvic of the kidney into the ureter to the urinary bladder.

sorry, but you do not have posted the diagram.