Certainly, this is the "save" button in LibreOffice. You click on it to save the data.
For the new computer users, they probably don't know that this button resembles the shape of a floppy disk.
A floppy disk stores 1.44MB of data only. It cannot help you if you want to store large files such as video files.
Amazon's website shows some floppy disk drives capable of reading the data on a floppy disk. I don't know if these drives will exist after a few years.
It will be hard for the new computer users to figure out why this is the "save" button.