Revolutions, S Type Honda, Tachometer

Revolutions per minute are usuall abbreviated as rpm, RPM, r/min, or r·min−1. RPM is a measure of the frequency of a rotation annotating the number of full rotations completed in one minute around a fixed axis. RPM is often used as a measure of rotational speed of a mechanical component that is often measured by a Tachometer. The standards organizations generally recommend using the symbol r/min, which is more consistent with the general use of unit symbols. However, this is not enforced as an international standard. France commonly uses tr/mn (tours par minute), and the German equivalent reads U/min (Umdrehungen pro Minute). The engine of a Formula One racing car can reach 18,000 rpm (300 Hz) under some circumstances. A tachometer (also called a revolution-counter, "Tach", rev-counter, or RPM gauge) is the instrument used to measure the rotation speed of a shaft or disk in a motor or other machine.
The S in an S type Honda stands for the Sport edition. In England and the rest of Europe Honda provides 2 different cars. For instance, a civic Type S has a slightly tuned 1.8l petrol or 2.2l diesel engine. The type R comes only in 2.0l petrol. Basically the S stands for sport and the Type R is for racing. The Type R vehicle is more powerfull and a faster car. Throughout the US and Japan this distinction is a little different. The Honda Type S is the USDM RSX while in Japan the Type R is the race version and offers suede seats, more agressive tuning, a front lip, sideskirt, and wing. This package also features a red valve cover and different head and tail lights. The S Type Honda has been finely tuned for better driving – based on Honda's experience in Formula One and aeronautics. It comes standard with many items including alloy wheels and a streamlined, sporty body shape. In the Type S class there are other designators such as: Type S-T, Type S GT, and Type S GT-T.
A tachometer is an device used to measure the rotation speed of a shaft or disk in a motor or other machine. It is also called a revolution-counter, "Tach", rev-counter, or RPM gauge. This instrument usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are becoming more common. The term is derived from Greek Ôá÷ïò, tachos, "speed", and metron, "to measure". Tachometers or rev counters show the rate of rotation of the engine's crankshaft, and typically have markings indicating a safe range of rotation speeds. Used on airplanes, cars, and other drive-able vehicles, its purpose to to help the driver select throttle and gear settings for the driving conditions. Prolonged high speed use of any type of vehicle can cause inadequate lubrication, overheating, and cause excessive wear or permanent damage or failure of the motor. The proper use of a Tach is supposed to help prevent this failure and damage.