The shell bone script of character Tool is
The middle part of both characters is tripod with a big cooking pot on the top, which is big pot for King's meal, or a banquet for guests in the palace. There are two hands holding the tripod on the bottom (left one) or on the top (right one).
The original meaning of the character is cooking pot with tripod.
The bronze script of the character is
The left one is similar to the left shell bone script above, the right one has no ears on the pot, and the legs and the hands overlapped in the middle fingers, which is unreasonable.
The big seal script of the character is
The top changes again, it is three horizontal lines inside of the top (the pot), with a long horizontal line in the bottom, the two hands become two long dots. Some similarity to the old script, but difficult to relate it to cooking pot with tripod.