Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Input: Consider Input: Pixel 2 and Pixel 2 XL are Android smartphones designed , developed and marketed by Google . They were announced during a Google event on October 4 , 2017 , as the successors to the Pixel and Pixel XL . They were released on October 19 , 2017 , and serve as the second set of smartphones in the Google Pixel hardware line .

Output: Pixel 2

Input: Consider Input: Profitability index ( PI ) , also known as profit investment ratio ( PIR ) and value investment ratio ( VIR ) , is the ratio of payoff to investment of a proposed project . It is a useful tool for ranking projects because it allows you to quantify the amount of value created per unit of investment .

Output: Profitability index

Input: Consider Input: The stapes or stirrup is a bone in the middle ear of humans and other mammals which is involved in the conduction of sound vibrations to the inner ear . The stirrup - shaped small bone is on and transmits these to the oval window , medially . The stapes is the smallest and lightest named bone in the human body , and is so - called because of its resemblance to a stirrup ( Latin : Stapes ) .
Output: Stapes