This is a broken piece of a shield. If you had enough of these, you could probably forge them into a new shield!
Shield Fragment price in Growtopia: sells for about 100/WL (median of 5 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: KLIAI, WITWO, PPXO, YENOK, WDUYU