Estrangela represents the oldest and most formal style of the Syriac script, serving as the monumental bookhand in which the earliest surviving literary manuscripts of Classical Syriac were executed. The etymology of the name Estrangela has been traced by philologists to two principal origins: either from the Greek adjective “strongyle,” meaning 'rounded' or 'circular' in reference to its curved, thick letterforms, or from the Syriac compound expression sert ekatbanya, denoting “gospel writing” due to its ubiquitous employ in early biblical codices. As a script, Estrangela developed directly from the early monumental Aramaic lapidary script of Osrhoene, which is attested in stone inscriptions dating from the first to the third centuries CE across Edessa, Sumatar Harabasi, and Dura-Europos.
Graphically, Estrangela is characterized by a clear, balanced, and upright ductus with well-defined geometric lines. The alphabet consists of twenty-two consonantal letters written continuously from right to left. The script is fully cursive, meaning that letters within a single word join together along a baseline.
The earliest extant dated literary manuscript in any Semitic language is written in Estrangela: British Library Manuscript Additional 12150, copied at Edessa in November of 411 CE, containing philosophical and theological works by Eusebius of Caesarea and Titus of Bostra. In its ancient classical form, Estrangela was copied as a purely consonantal text without vocalization signs. To resolve grammatical ambiguities among orthographically identical words (homographs), ancient Estrangela scribes developed a sophisticated system of single diacritical dots (homograph dots).
The operational mechanics of Estrangela homograph dots followed consistent structural positioning rules: a dot placed above a word indicated a fuller, open, or more vocalized grammatical form, whereas a dot placed beneath a word indicated a weaker, closed, or less vocalized form. For example, in verbal morphology, a supralinear dot above the triconsonantal skeleton k-t-b designated the active participle koteb (writing), while a sublinear dot beneath designated the third-person masculine singular perfect ktab (he wrote). In pronominal morphology, a supralinear dot marked demonstrative pronouns such as haw (that) and hono (this), whereas a sublinear dot marked personal pronouns such as hu (he) and hi (she) . Similarly, a sublinear dot beneath the prefix letter marked prepositions like men (from), while a supralinear dot marked interrogative or relative pronouns like man (who?).
In addition to single homograph dots, Estrangela manuscripts utilized plural markers and orthographic lines. Plural nouns, adjectives, and participles were universally marked by two horizontal supralinear dots termed syame (placing/setting). The syame dots were placed over a central letter of the word, preferably over the letter resh if present (combining with the inherent dot of resh) or over a letter lacking tall vertical ascenders. Silent consonants—such as the unpronounced eth in mdinto (city) or the silent alaph in certain verbal forms—were indicated by a horizontal sublinear or supralinear stroke known as the linea occultans or mabtana (canceller).
Following the emergence of Serto and Madnhaya as regional denominational scripts between the sixth and eighth centuries CE, Estrangela lost its monopoly over manuscript production. However, because Estrangela predated the Christological schisms, it retained absolute denominational neutrality across all Syriac communities. In modern printing and scholarly editing, Estrangela remains the prestige standard for monumental inscriptions, manuscript titles, chapter headings, and critical academic editions of Classical Syriac texts, such as those published in the Corpus Scriptorum Christianorum Orientalium (CSCO) series.