The word "gypoun" is a medieval term for a sleeveless tunic worn over armor. Its spelling can be explained through the use of the International Phonetic Alphabet (IPA): /dʒɪpən/. The "g" is pronounced as a soft "j" sound, and the "y" represented the "i" vowel sound. The combination of the "ou" is pronounced as a short "u" sound. This unique spelling is reflective of the evolving nature of the English language, especially with the influence of the Norman language during medieval times.