FSR stands for "Force Sensitive Resistor," a type of sensor that responds to pressure or touch. Although this term is the most common and widely used when referring to this technology, there are several synonyms associated with it. Some of the different names or terms used interchangeably with "FSR" include flex sensor, pressure sensor, touch sensor, tactile sensor, and force sensor. Each term has its own unique applications and benefits, but they all essentially describe the same type of device that detects and measures the amount of pressure or force being applied. Ultimately, the choice of terminology will depend on the specific application and context in which the sensor is being used.