From Tapestries MUCK
A prop is a simple bit of text stored somewhere on a character, a room, an object, etc. They are stored in propdirs.
Although it's common to see it like this instead to prevent spam
There are lots of ways to read props depending on what you want to do with them.
If you are just trying to find where it is and what it says, you can use the examine command (often abbreviated to just ex). For example:
The above command would show the prop that your wixxx and wixxx #detail are stored on if you have them set.
If you just want to display the value for a given prop, then you can use the prop (mpi) command.