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Universally Unique Identifier
 (
UUID
) 
instead of the 
/dev/sdaX
 naming convention you might be more accustomed to if 
you've worked with storage devices in the past. In my output, you can see UUID 
dm-
uuid-LVM-H8VEs7qDbMgv...
, which refers to my root filesystem, and you can also see 
that I have a 
swap
 file located at 
/swap.img
.
The concept of a UUID has been around for a while, but there's nothing stopping 
you from replacing the UUID with the actual partition names (such as 
/dev/sda1
 
or similar). If you were to do that, the server would still boot and you probably 
wouldn't notice a difference (assuming you didn't make a typo).
Nowadays, UUIDs are preferred over common device names due to the fact that the 
names of devices can change depending on where you place them physically (such 
as which particular