The Transcript is a standard-output-like object in the Smalltalk environment.
FYI; In classic Smalltalk, message cr alone does not output line breaks (it requires followed by an endEntry message i.e. Transcirptcr ; entEntry.), so there was a convention to output a line break firstly then output the text by using show: method in which includes the endEntry process. Hence the cr message is sending firstly in the idiom.