The scheme for classifying buildings in Scotland is:
Category A: "buildings of national or international importance, either architectural or historic; or fine, little-altered examples of some particular period, style or building type."[1]
Category B: "buildings of regional or more than local importance; or major examples of some particular period, style or building type, which may have been altered."[1]
Category C: "buildings of local importance; lesser examples of any period, style, or building type, as originally constructed or moderately altered; and simple traditional buildings which group well with other listed buildings."[1]
In March 2016 there were 47,288 listed buildings in Scotland. Of these, 8% were Category A, and 50% were Category B, with the remaining 42% being Category C.[2]
^Historic Environment Scotland assign a unique alphanumeric identifier to each designated site in Scotland, for listed buildings this always begins with "LB", for example "LB12345".