From Oxford dictionary:
Wikipedia says :
Square or geometric Kufic is a very simplified rectangular style of Kufic widely used for tiling. In Iran sometimes entire buildings are covered with tiles spelling sacred names like those of God, Muhammad and Ali in square Kufic, a technique known as banna'i.
And this is what was said by Kufic Guru, Mr Mamoun Sakkal:
Square Kufi, like other styles of Arabic calligraphy has its rules. However, because of its simple shapes, some calligraphers will try to write it even when they did not master these rules.
Such practice is not limited to students, but is often common among accomplished calligraphers.
And this is what George said about square kufic : (George is a researcher of square kufic)
Square Kufic is also known as geometric, rectangular, quadrangular, rectilinear or geometric Kufic. When used to create geometric patterns with alternating glazed tiles with plain bricks, it can sometimes be referred to with a Farsi word banna-i. If the brickwork design is in relief then it is referred to with the Farsi word hazarbaf (hazar baf).
Term covering a huge range of buildings and stylistic variations, but generally associated with buildings connected with the followers of Mohammed, or Muslims. Islamic architecture has several characteristic features, including the pointed, multifoil, low, wide, four-centred, and horseshoe arch, the muqarna or stalactite corbel, cladding of coloured glazed earthenware and patterned tilework, fretted gables of stone, marble, or stucco, and, above all, coherent and serene geometry. Domes, minarets, cloisters, and elaborate battlements, often of the almena type, are commonly associated with Islamic buildings.
Islamic architecture has influenced design in the West, notably the pointed arch and cusping in the medieval period, and the stylistic aspects of so-called Moresque architecture in which elements of Islamic, especially Moorish (e.g. the Alhambra, Granada, Spain), architecture were used as part of the European enchantment with exotic oriental styles in C18 (e.g. the work of Chambers at Kew) and C19 (e.g. Persius's steam-engine house at Potsdam (1841–2), and Aitchison's Arab Hall in Kensington (1877–9)).
Architectural style based upon that of Moorish buildings in the Iberian peninsula from C8 to C15. Earlier work was contemporary with Romanesque and was called Mozarabic. Later architecture infused with Gothic is known as Mudéjar. The Alhambra, Granada (mostly 1338–90), is a fine example of the style, which was revived elsewhere in Europe in C19 and C20, often for synagogues. It was also an ingredient of Catalan Modernisme.
Islamic architecture of North Africa and regions of the Iberian peninsula where the Moors were dominant (711–1492). The most perfect examples were the exquisite Alhambra, Granada (mostly 1338–90—which was probably a madrasa rather than a palace), and La Mezquita at Córdoba (785–987). Moresque is architecture like or derived from that of the Moors (see hispanomoresque), or, more loosely, from Islamic architecture, and the term is especially associated with formal foliate ornament of an interlacing type, also known as arabesque. Moorish influences had a considerable effect during the C19 enthusiasm for exotic Picturesque buildings, and they were exploited by many designers, such as Owen Jones