I am a small animal, which is sometimes termed a double S, and sometimes a V, and whi

I am a small animal, which is sometimes termed a double S, and sometimes a V, and which is reckoned to be of great use to the I, which is a capital letter, and to the V, which is a long one. I am never used except in connection with these two letters, and my principal employment is to connect them together, thus, V, which is an I, and V, which is an I, and to make a V, which is a V, and a V, which is a V, and so on, to any number of V's, which is I, and I, and I, and