The Russian word Звонок means ‘bell’, ‘ring’, ‘call’ or ‘buzzer’. It declines like so:

The word звонок can have a different meaning, depending on the context it is used in. For example, a door bell and a phone call are both translated as звонок. Also, there is an event called “последний звонок” (“last bell/buzz”), which is a celebration for high school students that are graduating. It is similar to american graduation ceremony and takes place between the last day of classes and the beginning of final exams. During the celebration, a small bell is rung quite often. It symbolizes a buzzer that sounds at the beginning and at the end of classes, letting the students know that a class period just started or ended.