The spelling of the word "HRDQT" is a bit unusual, but can be explained with the help of IPA phonetic transcription. The letters H, R, D, Q and T each represent a distinct sound. The letter H represents a voiceless glottal fricative /h/, R represents an alveolar trill /r/, D represents a voiced alveolar stop /d/, Q represents a voiceless uvular stop /q/, and T represents a voiceless alveolar stop /t/. When these sounds are combined, they form the unique spelling of the word "HRDQT".