Silver jubilee

Silver jubilee marks a 25th anniversary. The anniversary celebrations can be of a wedding anniversary, the 25th year of a monarch's reign or anything that has completed or is entering a 25-year mark.

Royal silver jubilees since 1750
Note: This list includes various reigning princes (by various titles) of petty states in Germany and elsewhere, who do not merit the designation "royal".

South Asian film terminology
In India and Pakistan, a silver jubilee film is commonly described as a movie shown continuously in cinemas in one city for 25 straight weeks without any interruptions.