heart

dumpling; A small lump made by massing the dough of grain powder.; core; string; fiber; The hard part in the center of the inside of a plant.; interlining; Fabric attached to the inside of the collar or shoulders of an upper garment in order to make them stiff.; lead; refill; The writing part in the inside of an writing instrument like a pencil, pen, etc.; wick; Something like a thread in the inside of a candle, which burns while the candle is burning.