In Canada many Universities use 2, 3 4 and 5 letters for the website. That is what students are used to.
Here are some examples.
The University of British Columbia
www.ubc.ca
Malaspina University-College
www.viu.ca
Dalhousie University
www.dal.ca
Emily Carr Institute of Art + Design
www.eciad.ca
University College of the Fraser Valley
www.ufv.ca
Memorial University of Newfoundland
www.mun.ca
Mount Allison University
www.mta.ca
Mount Saint Vincent University
www.msvu.ca
University of New Brunswick
www.unb.ca
University of Northern British Columbia
www.unbc.ca
Nova Scotia Agricultural College
www.nsac.ca
Nova Scotia College of Art and Design
www.nscad.ca
Ontario College of Art & Design
www.ocad.ca
University of Ontario Institute of Technology
www.uoit.ca
University of Prince Edward Island
www.upei.ca
Université du Québec à Montréal
www.uqam.ca
Université du Québec à Trois-Rivières
www.uqtr.ca
Université du Québec à Chicoutimi
www.uqac.ca
Université du Québec à Rimouski
www.uqar.ca
Université du Québec en Outaouais
www.uqo.ca
Université du Québec en Abitibi-Témiscamingue
www.uqat.ca
Institut national de la recherche scientifique
www.inrs.ca
École nationale d'administration publique
www.enap.ca
Royal Military College of Canada/
www.rmc.ca
Collège universitaire de Saint-Boniface
www.cusb.ca
St. Francis Xavier University
www.stfx.ca
St. Jerome's University
www.sju.ca
Saint Mary's University
www.smu.ca
St. Thomas University
www.stu.ca
Simon Fraser University
www.sfu.ca
Thompson Rivers University
www.tru.ca
Trinity Western University
www.twu.ca
University of Victoria
www.uvic.ca
The University of Western Ontario
www.uwo.ca
Wilfrid Laurier University
www.wlu.ca