The letter "Chi" for the Chiffrierabteilung is, contrary to what one might expect, not the Greek letter Chi, nor anything to do with the chi test,[3] a common cryptographic test used as part of deciphering of an enciphered message, and invented by Solomon Kullback, but only to the first three letters of the word Chiffrierabteilung (English:cipher department). Chi-Stelle, which was also a short hand for Chi, translates to Cipher Department Location.