Digraphs can be formed to signify sounds not covered by the main alphabet (e.g., ντ for /d/), or to represent diphthongs (e.g., αυ for /af/ or /av/). | Digraphs can be formed to signify sounds not covered by the main alphabet (e.g., ντ for /d/), or to represent diphthongs (e.g., αυ for /af/ or /av/). |