"Plasse" is a French surname that is pronounced [plas]. The spelling of this word follows standard French phonetics, where the "ss" represents a silent final consonant. In French, final consonants are often silent, and the emphasis is on the final syllable. Thus, "plasse" is spelled in a way that reflects its pronunciation in French. Although the word may be unfamiliar to non-French speakers, its spelling is consistent with standard French orthography.