There was two primary ways through which Guesque was expressed: "Priestly" and "Common".
The earliest "Priestly" abecedarium dates to 700 BC, it was used for writing administrative documents, accounts, legal texts, as well as mathematical, medical, literary, and religious texts. After 300 BC, the alphabet evolved, adjusting to the phonology of the Guesque language, and the "Common" script was the result of it. "Common" was mainly used to write letters, documents and other types of everyday writing. "Common" started to effectively replace "Priestly" after 100 BC, but "Priestly" survived in religious texts and in some more rustic regions of the Guesque homeland until 500 AD.
"Common" was not a internal development of Guesque, it was highly influenced, based and made through continuous contacts with the Greeks, Etruscans and italic peoples over time.
"Priestly"
The other letters that were not used in writing were kept and used as numerals, as in most other non-Greek languages using the Greek script. It was common for the glides /j, w/ to not be expressed in writing, voiceless/aspirate greek letters were constantly confused for one another, and the Guesque writers didn't consistently represented vowel and consonant length.
Common
The differences in the script are pretty straightforward, (nearly) all the aspirate consonants were ditched alongside letters representing phonemes nonexistent in Guesque. The long phonemes were represented by doubling the letter, a practice that was used inconsistently during the usage of the "Priestly" script.
The <φ> was used to represent the glide /j/, in a somewhat similar way to how the romans adapted <ϝ> to represent /f/.
shimobaatar wrote:
Is the direction in which Guesque is written any different from the directions in which surrounding languages are written?
During the usage of the "Priestly" script the direction of writing was free, but in "Common" it is mostly written from left to right, just like how Etruscans did.
shimobaatar wrote:
Word-finally, are <σ σσ> realized as <ς ςς> or <ς σς>, or do they not change "form", so to speak?
They don't change form.