To sign idea, first form the letter I sign with your dominant hand. Then touch the tip of your pinkie finger to your forehead before you lift your 'I' hand diagonally upward, away from your head. It is like an idea has been released from your mind.
Teach your toddler the idea sign when they have a creative or interesting idea that you can see coming to life through their game, like Lego or blocks, or through their artwork and crafts. "Hey, that's a great idea! That's so nice!"
Teach your toddler this sign in conjunction with encouraging adjectives, to cultivate in your child a love for learning and creativity.