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.

The Trevi Fountain ( Italian : Fontana di Trevi ) is a fountain in the Trevi district in Rome , Italy , designed by Italian architect Nicola Salvi and completed by Pietro Bracci . Standing 26.3 metres ( 86 ft ) high and 49.15 metres ( 161.3 ft ) wide , it is the largest Baroque fountain in the city and one of the most famous fountains in the world . The fountain has appeared in several notable films , including Federico Fellini 's La Dolce Vita , the eponymous Three Coins in the Fountain , and The Lizzie McGuire Movie .
Trevi Fountain

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 .
Profitability index

Probability is the measure of the likelihood that an event will occur . See glossary of probability and statistics . Probability is quantified as a number between 0 and 1 , where , loosely speaking , 0 indicates impossibility and 1 indicates certainty . The higher the probability of an event , the more likely it is that the event will occur . A simple example is the tossing of a fair ( unbiased ) coin . Since the coin is fair , the two outcomes ( `` heads '' and `` tails '' ) are both equally probable ; the probability of `` heads '' equals the probability of `` tails '' ; and since no other outcomes are possible , the probability of either `` heads '' or `` tails '' is 1 / 2 ( which could also be written as 0.5 or 50 % ) .

Probability