A rebus is a compact means of delivering a message in pictorial form. Some rebuses must be puzzled out, but to attract passers-by, a telegraphic image such as "two slices" would seem to be more effective. Like the other examples cited below, this signboard doesn't dispense with text altogether. The green lettering helps to visually separate the oversized "2" and "5"; the recessive type in the lower right corner ensures that the tax man gets his due.
Regina Cafe & Pizzeria
176-49 Union Tpk. (at Utopia Pkwy.), Utopia, Queens