The word "Dennes" is spelled with two "n"s, which might seem unusual to some English speakers. However, the reason for this spelling can be explained using the International Phonetic Alphabet (IPA). In IPA, the sound represented by "nn" is called a geminate consonant, and it indicates a longer, stronger sound than a single "n". This is why "Dennes" is spelled with two "n"s - to make the pronunciation clearer and more accurate. So next time you see a word with double letters, remember that there might be a good reason for it!