Sayce's phonetic values and interpretations of determinatives are his best assured achievements.
Thus signs, according to their employment, are said to be (I) wordsigns, (2) phonograms, or (3) determinatives.
Determinatives.Most signs can on occasion be used as determinatives, but those that are very commonly employed as phonograms or as secondary word-signs are seldom employed as determinatives; and when they are so used they are often somewhat differentiated.
Certain generic determinatives are, very common, e.g.:, t~; of motion.
This practice had the advantage also of distinguishing determinatives from phonograms. Thus the root or syllable un is regularly written ~ ~to avoid confusion with the detcrminative~.