The number 2 is signed by holding up your dominant hand in a fist, facing towards you, with your index and middle fingers sticking out.
The number 2 looks like the letter V, but this letter has the fist facing out. So to sign the number 2, make sure your fist is facing inward.
Teach your toddler the number2 sign when it is time for them to learn about basic numbers in school, or when they show curiosity about counting objects, money, etc.
This is a useful flash card taught best in conjunction with the other basic numbers.