The spelling of the word "vasko" is unique and can be explained using the International Phonetic Alphabet (IPA). The word "vasko" is pronounced as /ˈvæskoʊ/ in IPA, with the stress on the first syllable. The letter "v" is pronounced as /v/ and "a" as /æ/. The letter "s" is pronounced as /s/, while "k" is pronounced as /koʊ/. The spelling of "vasko" follows standard English phonetic rules and reflects the word's origins and pronunciation.