Pin tumbler lock. A common type of pin tumbler lock, of the euro cylinder type. The pin tumbler lock (or Yale lock, after lock manufacturers Yale) is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key.
noun. A person creating a diagram. A person creating a diagram. The definition of a diagram is a graph, chart, drawing or plan that explains something by showing how the parts relate to each other. An example of diagram is a chart showing how all the departments within an organization are related.
graph. 1  a diagram, as a curve, broken line, or series of bars, representing various kinds of quantitative information and relationships, such as the successive changes in a variable quantity or quantities. 2  Math. a curve or surface showing the values of a function.