Graham is a compute cluster located at the University of Waterloo in Ontario and is one of the national systems. Its login nodes can be accessed via SSH by connecting to graham.alliancecan.ca. Its Globus endpoint is gra-dtn1.alliancecan.ca. See https://docs.alliancecan.ca/wiki/Graham for more information.
NOTE: Depending on context, "graham" might be intended to refer to Graham Cloud.