How did biliteral and triliteral signs help readers interpret Egyptian hieroglyphs?

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hieroglyphics — hieroglyphic writing Hieroglyphics on a temple wall at Karnak, Egypt.

In the hieroglyphic writing system, biliteral and triliteral signs function as phonograms, which are signs that represent a specific series of sounds rather than a single phoneme or a complete word.1

These signs were essential for interpreting Egyptian texts because they allowed scribes to represent multiple consonants with a single character, effectively streamlining the writing of complex words. Because the Egyptian writing system primarily recorded consonants and generally omitted vowels, the use of biliteral and triliteral signs provided a phonetic framework for the language.1

To ensure clarity and assist readers in correctly identifying these sounds, scribes often accompanied biliteral and triliteral signs with simple phonetic signs that acted as reading aids. By combining these phonetic components with logograms and determinatives—which helped specify meaning and mark word boundaries—readers could navigate the nuances of the language despite the lack of explicit vowel representation.1