The word "trusser" is spelled with a double "s" in the middle, as it is derived from the verb "truss". The "ss" sound is represented in IPA phonetic transcription as /s/ and is pronounced as a voiceless alveolar sibilant. This sound is produced by pressing the tip of the tongue against the alveolar ridge (the bumpy area behind the teeth) and forcing air through the narrow opening. In English, this sound is often represented by the letter "s". So, the correct spelling of "trusser" helps to accurately represent its pronunciation.