A run of pipe, leg by leg, from the measurements in your hand.
/spool - also /pipe.
A scratchpad for a pipe run. Click where each leg ends, tell it how long that leg is, and it builds the spool.
Click a leg already in the list to change it, or take it off.
Each leg says which it is, because a pipe fitter's tape does not measure the same thing twice:
Getting that wrong is how a spool comes back short by two fitting allowances, so it is asked outright rather than assumed.
A solid in the drawing, and a cut list with the legs on it.