What are these hidden UNIX Executable Icon files?

I have a lot of Word Processing documents in a series of subfolders, nested in my User/Documents folder. In a couple dozen of these folders I've found hidden UNIX Executables named simply Icon, all of them listed at 0 bytes.

I only found these files when iDrive wouldn't consider them for backup, which I guess that service is prone to do if it encounters a file-type it doesn't recognize.

Some background, if it should help: Most of these nested folders contain Pages documents that were originally created by other apps (MS-Word Windows & Mac, Appleworks, WordPerfect) and recently converted to .pages files.

I'm assuming I can trash these files but, as they aren't taking up space, the only result of doing so would be to clean up my iDrive Session Log files, so why not keep them, right?

Except that it drives me nutty when there's stuff in my Home Folder that I didn't put there and for which I can't identify any use.

Let me know what you think.

Thanks.

*Please feel free to move this to another Community, if appropriate.