The syntax lsm file list [source] [target] is verbose but unambiguous.

Because these files contain raw, uncompressed data, they are often massive—sometimes reaching several gigabytes for a single experiment. This is why many researchers and archivists turn to torrents to distribute them. Why Use Torrents for LSM File Lists?

: Many results for this specific string lead to dead Google Drive links or forum spam that offers no actual content. Gift Guide For The Cozy Lover | Ruthie Ridley

If you are seeing this term in a non-scientific context, it might be a specific (though less common) usage or a typo for other formats: ZeissLsm | Scientific Volume Imaging