The shell bone script of character Work is
or simplified one
There is dispute what it is. Some people including Dictionary of Pictography believe that it is a multiple functions iron tool used by carpenters. More people believe that it is impossible that there were iron tools in 3500+ year ago, it should be carpenter's ink marker.
The front box is ink box with black ink inside, the back box has a wire coil, there is a hole between the two boxes, the wire goes through the hole and another hold in front of the box to get out. The wire has ink on, carpenter puts the wire on wood he works on, and makes a straight line he needs.
I agree with that the character means carpenter ink marker, which is important for carpenter work, which is important for most ancient projects.
The first character above has an ink box at the bottom and a nail on the top, which is like a carpenter ink marker. The second one is simplified, the box becomes a line.
The bronze script of the character is