The use of household pennants is a common tradition in Finland. A household pennant (Finnish: isännänviiri, Swedish: husbondsvimpel) can be flown whenever there is no flag day and it is traditionally a means of telling that the "master of the house" is at home. These pennants have a long, narrow, triangular shape. Length of the pennant is usually half the length of the flag pole and the width of the base is roughly one tenth the pennants length. A crossbar is attached to the base of the triangle which is linked the pole via a single lanyard. It gives the pennant the ability to revolve around its horizontal axis while flying. Thus, either side of the pennant may be seen and often symmetrical designs are used to avoid different mirroring.