The jugular venous pulsation has a biphasic waveform. Triplex plunger pumps use three plungers, which reduces the pulsation of single reciprocating plunger pumps. Surge suppressors perform surge relief by acting as a pulsation dampener. A sinusoidal time varying flow is used to simulate the pulsation of a heart. The pulsation seen is called the jugular venous pressure, or JVP. Intra-oral examination should include observations for asymmetry, discolouration, pulsation and obstructions in the duct orifices. Symptoms include a rapid pulsation, an abnormally rapid or irregular beating of the heart. Pulsar planets are discovered through pulsar timing measurements, to detect anomalies in the pulsation period. The internal jugular vein is visualised when looking for the pulsation. Identifying arterial pulsation in the anatomical snuff box is therefore recommended. It achieves a kind of pulsation or undulation, rather than separating the notes. Any bodies orbiting the pulsar will cause regular changes in its pulsation. Car washes often use these triplex-style plunger pumps (perhaps without pulsation dampers). This allows extreme turndown (low-flow) without significant pulsation. The cycloturbine variety has variable pitch to reduce the torque pulsation and is self-starting.