Pinometer
From PinataIsland.info, the Viva Piñata wiki
A pinometer is the standard unit of measuring distance in Viva Pinata. On your Pinatas info page you can see how many pinometers it has walked since becoming a resident. Square Pinometers are used in measuring an amount of something that you have (e.g. grass). Having a large enough area is part of the requirements for a pinata to become a resident, have a romance dance, or stay healthy. (Crowded pinatas will become ill if they don't have enough room to roam.)
Note: 10 square pinometers equal 1% of the largest Garden.