We introduce a notion of localization for dyadic functions, i. e. functions defined on Cantor group. Both nonperiodic and periodic cases are discussed. Localization is characterized by functionalsUC_d and UC_{dp} similar to the Heisenberg (the Breitenberger) uncertainty constants used for real-line (periodic) functions. We are looking for dyadic analogs of uncertainty principles. To justify definition we use some test functions including dyadic scaling and wavelet functions.