It may seem like a random jumble of letters, but "RZDPSK" actually follows some interesting phonetic rules. In IPA transcription, the word would be spelled /ɹzdiːpiːɛskuː/. The "RZ" at the beginning combines two consonant sounds, /ɹ/ and /z/, while the "DPSK" at the end consists of four separate consonant sounds, /d/, /p/, /s/, and /k/. The vowels in between, /iː/ and /ɛ/, provide some variety and break up the string of consonants. Despite being difficult to pronounce, the spelling of "RZDPSK" is actually quite logical in terms of phonetics.