Lists

Two or more arguments with no functions in between form a list.

      2 0 1 9
2 0 1 9

      'λ' (4.5 2.2) 'string'
λ 4.5 2.2  string

      ]box on
Was OFF
      'λ' (4.5 2.2) 'string'
┌─┬───────┬──────┐
│λ│4.5 2.2│string│
└─┴───────┴──────┘

Two or more characters, or none, enclosed in quotes form a list of characters, but exactly one character is not a list.