The term “21” can refer to a variety of different things depending on the context in which it is used. In its simplest form, 21 is simply the number twenty-one.
This number has been found throughout history and often appears as a symbol of luck or fortune due to its divisibility by three and seven, two numbers believed to be lucky for many cultures around the world.
In card games such as blackjack, 21 refers specifically to an unbeatable hand composed of any combination of cards that add up exactly equal twenty-one points when added together. For instance, if someone had an ace (11 points) plus a ten (10 points), they would have 21 total points – also known as blackjack or ‘21’ – which would beat all other hands at the table except another player who also had 21 with their own set of cards.
Finally, in some contexts outside card games like movies or books about gambling culture, “21” may be used more generally just mean good luck or success; this could range from winning big at casino tables all away up through achieving one’s life goals regardless how difficult those might seem.
This phrase implies that no matter what challenges lie ahead there will always be hope for finding success with enough hard work and dedication – something akin to rolling snake eyes but still coming out on top despite your odds being stacked against you!