ゼロ
ゼロ · zero · JLPT N5 · noun
nothing
0️⃣ ゼロ = English zero in katakana: ze-ro
A loanword from English zero, written in katakana as ゼ (ze) + ロ (ro). Japanese also has the native-style reading れい (零) for the same number, but ゼロ is the everyday borrowed form, so the sound you already know carries over.