the "C" in the middle of that diagram is the logo for the Conservative Party of Canada.
background: there are two "top-tier" parties in canada, the liberals and the conservatives. their names are descriptive: the liberals lean left, the conservatives lean right (sometimes far-right...). on the second tier are parties that will never win the majority but occasionally can be part of a coalition government: the New Democratic Party (far-left/socialist), and the Bloc Quebecois (left-leaning, separatist).