Just gonna leave this work of art here:
The Manual of Military Marvels https://m.youtube.com/watch?v=eb_a7u3K8Bo
It looks to be a shot off of the Sir Issac Brock Bridge on Bathurst Street looking west towards Liberty Village
It might be some sort of survey benchmark. If there’s one on each end of the bridge, it could be for measuring alignment of the movable section against the stationary section
Or just pronounce it “lawn” like all my calculus instructors did
D