The ultimate goal of this study should be a deciphering of Raven inscriptions. Unfortunately at this stage such an aim is unrealistic. At the moment it is not even possible to determine nature of signs: holographs, alphabetic, or mixture of both. The fact that the script was found at Raven gives an opportunity to date it between establishing of city of Raven before 852 AD and beginning of spread of Glagolitic alphabet in Bulgaria around 886. There is largely undated corpus of purely logographic inscriptions as Horn inscription, Byala inscription, Shudikovo inscriptions, and so on (1). They have to be more archaic, as, at least theoretically, alphabetic signs must have been created out of logographic characters. The inscription of the Rosette of Pliska and most of Murfatlar inscriptions are alphabetic (2). Cyrillic inscriptions date Murfatlar monastic complex to first half of 10th century (Popkonstantinov, K. 1986, p. 102) when Dobruja's stone wall war erected, so th...