Vous avez cherché: digraphs (Anglais - Gallois)

sorting digraphs
trefnu deugraffau

digraphs in abbreviations
deugraffau mewn byrfoddau

however, in a situation where a letter count is necessary, it is important that any processing of, or reference to, welsh language text is sensitive to the use of digraphs and counts them as a single letter.
fodd bynnag, mewn sefyllfa lle mae angen cyfrif llythrennau, mae'n bwysig fod unrhyw brosesu a wneir ar destun cymraeg, neu unrhyw gyfeiriadau ato, yn sensitif i'r defnydd o ddeugraffau ac y'u cyfrifir fel un llythyren.

a consistent strategy and algorithm for the correct sorting of digraph letters shall be defined and used throughout the application wherever textual information is sorted.
rhaid diffinio strategaeth ac algorithm cyson ar gyfer trefnu deugraffaun gywir au defnyddio gydol y rhaglen lle bynnag y rhoddir gwybodaeth destunol mewn trefn.