См.: точка входа.
entry pointentry point - Any entity within a sufficiency-based logic diagram that does not have a cause or causes as indicated by the absence of an incoming arrow(s).
Usage: By convention, when creating a logic diagram, an entry point entity that is encased in a round-cornered rectangle is assumed to exist in the situation or the organization's current reality and may be designated as a fact of life. An entry point entity encased in a square-cornered rectangle is an injection, and may be either an action to be taken, or a condition or system state that does not yet exist.