The spelling of the word "c-a" may seem peculiar, but it actually follows the phonetic rules of the English language. In IPA transcription, this word is represented as /siːeɪ/. The first letter, "c," is pronounced as "s" since it is followed by a vowel. The second letter, "a," is pronounced as "ay" due to the long vowel sound represented by this letter. Together, these two letters create the sound /siːeɪ/, and when spelled out, it is simply "c-a."