1. sps: Samples per second. In data conversion, an analog signal is converted to a stream of numbers, each representing the analog signal's amplitude at a moment in time. Each number is called a "sample." The number sample per second is called the sampling rate, measured in samples per second.
2. ksps: Kilosample(s) per second (thousands of samples per second)
3. Msps: Megasamples per second (millions of samples per second)