Islero was a Miura Bull famed for killing the celebrated bullfighter Manolete on August 28, 1947. Bulls from the Miura ranch, located near Seville, Spain, are known for being large and ferocious.
https://en.wikipedia.org/wiki/Islero
As additional information, the Merrill Lynch logo we like. Also something like the Swiss bank Pictet. However our idea is not to generate bias in the creative capacity of the designers.
Of course the symbol of the Spanish Fighting Bull (Toro Bravo, Toro de Lidia,
Touro de Lide) is desired.