In the second book of the Hitchhiker's Guide to the Galaxy series, contractors were told not to install a teleporter into a ship that's going to be sent into the sun. They did it anyway and put it in for 5x the price under "Sndry, explns." in the bill.
... the foreman had explained that the accountant could go and boil his head and the accountant had explained to the foreman that the thing approaching him rapidly from his left was a knuckle sandwich. After the explanations had been concluded, work was discontinued on the teleport which subsequently passed unnoticed on the invoice as “Sund, explns.” at five times the price.
I get that the first part is "sundry", but what is "explns"?