Container for a beverage or foodstuff preparation machine, the container for containing beverage or foodstuff material and comprising a code encoding preparation information, the code comprising a reference portion (80) and a data portion (78). The reference portion (80) comprises three reference units (86) defining a reference line (81), the three reference units (86) being arranged at the vertices of an isosceles reference triangle having a reference apex angle. The data portion comprises discrete positions (75) at locations determined relative to the reference line (81), each discrete position either comprises or does not comprise a data unit (82) to at least partially encode the preparation information, wherein the discrete positions (75) are arranged at vertices of a grid of isomorphic tessellating isosceles data triangles, the data triangles having a data apex angle different from the reference apex angle.