Cherry in sign language looks like your are outlining a cherry on a stem. Extend your pinkie from your non-dominant hand, to make the stem of a cherry. Then take the fingers from your dominant hand and place them around the end of the non-dominant pinkie, twisting the fingers around.
Note that cherry is slightly different from berry in ASL, where the latter is signed by wrapping your dominant fingers around the non-dominant index or pointer finger.
Cherry is a fun sign for babies that enjoy eating the corresponding fruit. You can teach the sign using real-life cherries, or using the cherry flash card.
Use cherry when describing the fruit or the flavor which is common in ice cream and yogurt.