The term 'CERTAIN FINGER' is referring to two of the five fingers on a human hand. The INDEX finger, which is also known as the forefinger, is the first finger and is represented by the letter 'I' in the American Sign Language alphabet. It is the longest finger and is located between the thumb and the middle finger. The pinkie finger, also known as the little finger, is the smallest finger and is located at the outermost side of the hand. It is represented by the letter 'L' in the American Sign Language alphabet.