Refers to a small piece or fragment, often of wood or glass.
Al tropezar con la mesa, una esquirla del vidrio se le clavó en la mano.
When he tripped over the table, a shard of glass pierced his hand.
Al caminar descalzo, sentí una esquirla de vidrio que me cortó el pie.
While walking barefoot, I felt a shard of glass that cut my foot.