The idea that that icosahedral structures assignable to water clusters could define a geometric representation of some kind of code is very intriguing. Genetic code is of course the code that comes first in mind. The observation that the number of faces of tetrahedron (icosahedron) is 4 (20) raises the question whether genetic code might have a geometric representation. In TGD framework also a second code emerges: I have christened it memetic code. Also memetic code could have a geometric realization. Another purely TGD-based notion is that of dark DNA allowing to assign the states of dark protons with DNA,RNA, tRNA and amino-acids and to predict correctly the numbers of DNA codons coding for a given amino-acid in vertebrate genetic code. A further element is the possibility of strong gravitation in TGD Universe meaning that space-time geometry and topology can be highly non-trivial even in condensed matter length scales. These ingredients allow to imagine geometric representations of genetic and memetic codes.