However, some of the graphic materials found in 1899 at Pliska give reason to think that the system of “signs” is more than masonry marks. For example, some characters are incised in groups of two or three and sometimes form a ligature. However, the researchers of the time were digging into ruins filled with hundreds of pieces of Greek, Roman and Cyrillic inscriptions. The dilemma of the character of the newly discovered system of signs could be only: masonry marks or letters of an alphabet. Even if some of those signs were letters of an unknown alphabet, a string of three letters can barely make a word, and of course, it is hard to be assumed as an inscription. Ruins of Pliska This is probably why they didn’t notice that the same system of "signs" was used in drawings they discovered on the walls and bricks of Pliska. It is true that those signs are incorporated into the pictures and usually look like random scratches, and when Skorpil noticed that there were signs in the ...