A 4th anniversary is referred to as the Linen Anniversary. This name comes from the traditional gift associated with this milestone, which is linen or silk. Linen has been used for centuries to make clothing and other household items due to its breathability and durability. Furthermore, linen symbolizes reliability, strength and a bond that will last through time. Giving a loved one a special item made of linen marks the longevity of your relationship's foundation.