 Akkadian emphatic consonants are typically reconstructed as ejectives, which are thought to be the oldest realization of emphatics across the Semitic languages.One piece of evidence for this is that Akkadian shows a development known as Geers' law, where one of two emphatic consonants dissimilates to the corresponding non-emphatic consonant.For the sibilants, traditionally /š/ has been held to be postalveolar , and /s/, /z/, // analyzed as fricatives; but attested assimilations in Akkadian suggest otherwise.