Signs of length

Abstract In Vertegaal 2017, it was argued that plene spellings(〈CV-V〉 sign sequences) in Hieroglyphic Luwian can be divided into two types: space-fillers on the one hand, and non-fillers on the other. This article focuses on plene spellings of the latter kind, as attested in texts from the Iron Age (CHLI). It is demonstrated that these non-filler plene writings are non-randomly distributed across morphemes and lexemes, indicating that this mode of spelling marks a phonetic feature. Using secure etymologies and analyses, it is proposed that non-filler (“linguistically real”) plene spellings mark the presence of long vowels or disyllabic sequences. The validity of this hypothesis is subsequently tested against less secure and doubtful etymologies as well as counterexamples. Finally, it is concluded that the hypothesis holds, thereby providing, for the first time, direct evidence for the writing of vowel length in Hieroglyphic Luwian.