What does 1CID stand for?

1CID stands for 1st Canadian Infantry Division

This definition appears very rarely

Samples in periodicals archive:

4th Reconnaissance Regiment (4th Princess Louise Dragoon Guards) Reconnaissance Regiment of 1st Canadian Infantry Division and Infantry Regiment of 12th Infantry...

List of Canadian divisions in World War II: 1st Canadian Infantry Division; 2nd Canadian Infantry Division; 3rd Canadian Infantry Division; 3rd Canadian Infantry...