The letter K is signed by holding up your dominant hand, palm facing out, with your index and middle fingers sticking up like the letter 'V' (or like the common "peace" sign), while your thumb is tucked at the base of the two extended fingers. Your two remaining fingers are curled in, touching your palm.
The letter K is signed like P, but the latter is signed with the 'V' legs pointing down.
Teach your toddler the letter K sign when it is necessary to finger-spell some simple words - or the initials of objects, places, animals, or people's names. That way, your toddler slowly begins to associate the sign with the sound of the letter in a word or name.
This is a useful flash card taught best in conjunction with the other letters of the alphabet.