The term "triangular arch" is not widely recognized in established architectural, engineering, or mathematical literature as a standard technical term. While "arch" typically refers to a curved structural element that spans an opening and supports weight, often seen in architecture, the modifier "triangular" suggests a three-sided or angular form, which contrasts with the typical curved geometry of arches.
In conventional architectural typology, arches are generally categorized by their curvature (e.g., semicircular, pointed, parabolic, or segmental). A triangular shape does not align with these standard classifications, as triangles are polygonal and lack the continuous curve characteristic of most arches. Therefore, "triangular arch" may be a descriptive or informal term rather than a formally defined concept.
Possible interpretations could include a structural form that approximates an arch using straight, angular segments arranged in a triangle-like configuration, or a decorative motif combining triangular and arched elements. However, such usages are not standardized, and accurate information regarding a defined "triangular arch" in technical or historical contexts is not confirmed.
Due to the lack of reliable sources referencing "triangular arch" as an established concept, its meaning remains ambiguous and context-dependent.