Georgian script is the name for the writing system used for the Georgian language and it is one of the last languages in the world to use an alphabet.
Georgian is presently written in a 33-letter alphabet, as five letters are obsolete. The number of Georgian letters used in other Kartvelian languages varies. Mingrelian uses 36: thirty-three that are current Georgian letters, one obsolete Georgian letter, and two additional letters specific to Mingrelian and Svan. Laz uses the same 33 current Georgian letters as Mingrelian plus that same obsolete letter and a letter borrowed from Greek for a total of 35. The fourth Kartvelian language, Svan, is not commonly written, but when it is, it uses Georgian letters as utilized in Mingrelian, with an additional obsolete Georgian letter and sometimes supplemented by diacritics for its many vowels.
Mkhedruli inscriptions of the 10th and 11th centuries are characterized in rounding of angular shapes of Nuskhuri letters and making the complete outlines in all of its letters. Mkhedruli letters are written in the four-linear system, similar to Nuskhuri. Mkhedruli becomes more round and free in writing. It breaks the strict frame of the previous two alphabets, Asomtavruli and Nuskhuri. Mkhedruli letters begin to get coupled and more free calligraphy develops. (Source: en.wikipedia.org)
In Nuskhuri manuscripts, Asomtavruli are used for titles and illuminated capitals. The latter were used at the beginnings of paragraphs which started new sections of text. In the early stages of the development of Nuskhuri texts, Asomtavruli letters were not elaborate and were distinguished principally by size and sometimes by being written in cinnabar ink. Later, from the 10th century, the letters were illuminated. The style of Asomtavruli capitals can be used to identify the era of a text. For example, in the Georgian manuscripts of the Byzantine era, when the styles of the Byzantine Empire influenced Kingdom of Georgia, capitals were illuminated with images of birds and other animals.
According to the traditional account written down by Leonti Mroveli in the 11th century, the first Georgian script was created by the first ruler of the Kingdom of Iberia, Pharnavaz, in the 3rd century BC. However, the first examples of a Georgian script date from the 5th century AD. There are now three Georgian scripts, called Asomtavruli "capitals", Nuskhuri "small letters", and Mkhedruli. The first two are used together as upper and lower case in the writings of the Georgian Orthodox Church and together are called Khutsuri "priests' [alphabet]". (Source: en.wikipedia.org)