The spelling of the word "ABCD" uses individual letter names to create its pronunciation. In IPA phonetic transcription, it can be spelled as /eɪ bi si di/. The first two letters "AB" are pronounced as the long "A" sound and the letter "B" respectively. The last two letters "CD" are pronounced with the long "E" sound followed by "SEE" and "DEE". "ABCD" is typically used as an abbreviation in various contexts, such as in alphabetical order or in computer programming.