That is the root of 'cipher'; meaning zero/empty/nothingness.
I knew 'sifr' was an Arabic word and only today I came to know that it works in Farsi too.
The double pun/irony is that the John Sipher's surname is related to the topic of cryptography and that the etymological roots is Middle-Eastern.
https://www.etymonline.com/word/cipher
(Al Jabr, the translator of Indian Mathematical texts was a Persian IIRC)
Al-Khwarizmi authored the book Al-Jabr.