The word "tappe" is spelled with two p's in order to accurately represent its pronunciation. In IPA phonetic transcription, the word is spelled /tæp/, with the "a" sound pronounced as in the word "cat" and the "p" sound pronounced as a voiceless bilabial plosive. The second "p" is needed to indicate that the word ends with this sound, rather than simply having a single "p" sound followed by a silent "e." The spelling of "tappe" ensures that it is pronounced correctly by English speakers.