The triple point is the specific temperature and pressure at which ice, liquid water, and water vapor can coexist in thermodynamic equilibrium. For water, this occurs at exactly 273.16 K (0.01°C) and a pressure of 611.657 pascals. The triple point is a fundamental concept in thermodynamics and is used to define the Kelvin temperature scale.

Among the given options:
– [A] Freezing point refers to the temperature at which a liquid turns into a solid.
– [B] Boiling point is the temperature at which a liquid turns into vapor.
– [C] Critical temperature is the temperature above which a gas cannot be liquefied, regardless of pressure.
– [D] Triple point is the correct term for the temperature and pressure where ice, water, and vapor are in equilibrium.

Thus, the correct answer is [D] Triple point.