If you are using OSX this is wonderful because you can customise your command line by adding emoji icons to the bash prompt.
You can find icons inside your Edit menu: Edit -> Emoji & Symbols.

How to add custom icons to our bash?
So edit your .bash_profile with your favourite editor vim, nano for example, and add the line:
PS1=" "
Open Emoji & Symbol panel and drag and drop your favorite emoji inside quotation marks.

Depending on terminal settings, nothing may be visible after using drag & drop. Close and reopen you terminal and voilà:
You can customise terminal bash with some others options:
\d | Current date |
\t | Current time |
\h | Host name |
\# | Command number |
\u | User name |
\W | Current working directory (ie: Desktop/) |
\w | Current working directory with full path |
This is my favourite customisation:
PS1="🌀 \[email protected]\h\W$ "
What’s yours?