SPT or Standard Penetration Test is a commonly used method to determine the geotechnical properties of soils. The test measures the resistance of soil layers against a standard sampler driven into the ground. However, there are various synonyms that denote the same testing method. These include Static Cone Penetration Test (SCPT), Cone Penetration Test (CPT), Dynamic Penetration Test (DPT), and Dynamic Cone Penetration Test (DCPT). These terms are often used interchangeably in the geotechnical industry, and they all aim to provide critical information about soil behavior, including strength, stiffness, and permeability. Understanding the different synonyms of SPT helps geotechnical engineers and developers choose the appropriate testing method for their specific needs.