Symbols

A symbol is written by prefixing an a word with a colon.
Symbols often used as keys in Hashes (see in next section)

Examples

:age
:"age"
:name

:name.class #=> Symbol

Common Uses

Convert a string to symbol (to_sym)
```
animal = "dog"
animal.to_sym
=> :dog
```
Convert a symbol to string (to_s)
```
animal = :dog
animal.to_s
=> "dog" 
```