Probably an HB pencil - Commonwealth countries tended to use a different hardness measure for pencils than the US. I think Waterloo is a Canadian university.
Am Canadian, never heard of a #2 pencil but very much had HB pencils
Woah, TIL that HB was not a branding mark on the #2 pencils I used growing up!
HB is the middle of the scale. From there it's going both ways. Hs are harder and Bs are softer. There's also an F thrown into that scale for extra confusion.