3 million units of the motion controller worldwide.
The number was announced by SCEA's Gabe Ahn during a GDC Online presentation this week. It's the first sales figure that Sony's announced for the PlayStation Move since it confirmed shipments of 4.1 million in December last year.
It's unclear how many units Sony has actually sold to consumers, but it's probably safe to say the number is in the same ball-park. After all, retailers rarely buy copious amounts of a product that's unlikely to sell.