“…Thus, when one changes the scope from continuous to digital, there could be many other choices than the square/rectangular grid. Digital geometries of the other two regular grids, the triangular and hexagonal grids are also widely used and applied (Abdalla & Nagy, 2020;Brimkov & Barneva, 2005;Deutsch, 1972;Gaspar et al, 2009;Her, 1995;Kardos & Palágyi, 2015, 2017Lukic & Nagy, 2019;Matej et al, 1998Matej et al, , 1999Middleton & Sivaswamy, 2005;Nagy, 2002Nagy, , 2004aNagy, , 2004bNagy, , 2007Nagy, , 2014Nagy & Lukic, 2016Nagy & Moisi, 2017;Nagy & Strand, 2011). They have various advantages over the square grid as, for example, they have more directions of symmetry axes.…”