When trying to call `/dev/tcp/www.google.com/80`, by typing

 /dev/tcp/www.google.com/80

 Bash says `no such file or directory`. When looking at other people's code online, they use syntax such as 
 
 3<>/dev/tcp/www.google.com/80


I noticed that this works as well: 
 
`</dev/tcp/www.google.com/80`

Why are these symbols required to call certain things in bash?