The term 'coiled lock of hair' can be described by the four-letter word 'CURL'. A CURL is a type of hairstyle in which the hair is styled into a round shape, usually with the use of a curling iron or rollers. This style is often used to create a more voluminous look and can be achieved with both long and short hair. The term 'coiled lock of hair' specifically refers to a single strand of hair that has been curled.