I'm not sure if this has been asked. I'll explain the question by an example.
Fields are often denoted by the letter k, which comes from the German word Körper, meaning body (like corpse, corporeal).
Most mathematical symbols relate directly or indirectly to the English names, so what other exceptions are there?
(Yes, this is inspired by the other post about languages in math)
Best Answer
$\mathbb{Z}$ comes from the German "Zahlen" which means "numbers".