cero
/ˈθeɾo/ · B1 · num
zero
cero = zero with a lisped start: THEH-ro, same Arabic root sifr (empty)
Cero and zero are the same word: both come from Arabic sifr, meaning empty, via Italian zero. Swap the English z for the Spanish c (said th in Spain, s in Latin America) and you have it. Cipher is a cousin from the same root.