§15. The word "to signify" is perhaps used in the most straightforward way when the object signified is marked with the sign. Suppose that the tools A uses in building bear certain marks. When A shews his assistant such a mark, he brings the tool that has that mark on it.
It is in this and more or less similar ways that a name means and is given to a thing.—It will often prove useful in philosophy to say to ourselves: naming something is like attaching a label to a thing.