The flashlight sign looks like you are holding a flashlight. Your non-dominant hand is the 'holding' arm: you touch your index finger to your thumb to make a circle (like the ASL sign for 'O'), then touch it against the wrist of your dominant hand. Your dominant hand starts as a closed fist then quickly opens with all fingers spread out, to signify the beam of light.
Flashlights are a favorite toy among young children. First teach the basic flashlight sign, then expand to teaching the concepts of on and off.
Just like fans and other electric gadgets, your baby will show some interest for flashlights. Explore giving your little one access to a baby-safe flashlight to help alleviate anxiety associated to bedtime.