Aside from official hotels and resorts, the other principal lodging option in Cuba is a casa particular, or private house.
An official casa particular should display a small plaque or sticker declaring it to be a government sanctioned casa. The symbol is a blue capital "H" set on its side, with slightly bent horizontal lines, and the top horizontal line longer than the bottom one. (It also looks like an anchor.) It should also say Arrendador Divisa. This means the owner of the house is allowed to rent rooms for divisa (hard currency). Houses with red symbols can only rent to Cubans for moneda nacional.
One said that these red onces are Fiedel's answer to the multipolar family and too small houses and the low birthrate problems...