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I actually needed to look that up, since I didn’t know either. So, thank you, I’ve learned something new because of your question.

          d/s    The number (after merges) of discard requests
                 completed per second for the device.

          f/s    The number (after merges) of flush requests
                 completed per second for the device.  This counts
                 flush requests executed by disks. Flush requests are
                 not tracked for partitions.  Before being merged,
                 flush operations are counted as writes.

man7.org/linux/man-pages/man1/iostat.1.html

(Discards being TRIM operations on SSDs, I imagine.)

Original

I actually needed to look that up, since I didn’t know either. So, thank you, I’ve learned something new because of your question.

          d/s    The number (after merges) of discard requests
                 completed per second for the device.

          f/s    The number (after merges) of flush requests
                 completed per second for the device.  This counts
                 flush requests executed by disks. Flush requests are
                 not tracked for partitions.  Before being merged,
                 flush operations are counted as writes.

man7.org/linux/man-pages/man1/iostat.1.html