Here are a few possible ways to sign it:
* The most common way is to sign "grain" and then make a specific sign for "rice." You would do this by signing "grain" (which involves bringing your dominant hand from your forehead down to your chin in a curved motion) and then forming the sign for "rice" by making a fist with your dominant hand and then extending your thumb and index finger to form a "V." You would then move your hand from your chin down to your palm as if you are pouring rice.
* You can also use a "fingerspelled" sign. This involves spelling out the word "R-I-C-E" using your fingers.
* Another option is to use a gesture or mime to represent rice. For example, you could use your fingers to mimic the shape of rice grains or you could make a scooping motion as if you are pouring rice from a bag.
The best way to learn the most common sign for "rice" in your local area is to consult with a local ASL interpreter or sign language instructor. They can provide you with the most up-to-date information and ensure you are using the correct sign in your community.