The diagram shows part of teeth on the upper jaw of a human being.

The stem says the diagram shows part of the teeth, and the drawing gives five teeth per side, not the eight of a full quadrant: one of each type at the front and two molars behind. Read from the midline outward the first tooth is a wedge (an incisor), the second is the sharply pointed diamond that only a canine has, the third is a rounded tooth with no point, and the last two are squares carrying the drawn cusp pattern of molars. X labels the third, which sits between the canine and the molars and is therefore a premolar.