The spelling of the word "OLLON" can be explained using IPA phonetic transcription. This word is pronounced as /ɔlɔ̃/, with the first syllable having an "oh" sound, and the second syllable having a nasalized "oh" sound. The letters "OLL" represent the sound of the French letter "O" which corresponds to the vowel sound "oh" in English. The "ON" at the end of the word represents a nasalized vowel sound that is common in French. Overall, the spelling of "OLLON" reflects the unique sounds of the French language.