Which symbol represents organic clay of high plasticity?

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The symbol that represents organic clay of high plasticity is OH. In soil classification, different symbols are used to categorize the properties and characteristics of various soil types based on their plasticity and organic content. The designation "OH" specifically indicates a subset of organic soils that exhibit high plasticity. This classification helps engineers and geotechnical professionals assess the behavior of the soil for construction purposes and understand its potential for expansion or contraction with moisture changes.

The other symbols pertain to different soil types or characteristics. OL stands for organic clay of low plasticity, PT is used for peat or highly organic soils, and MH denotes inorganic soils of high plasticity, but these do not align with the specific description of organic clay of high plasticity. Understanding these classifications is crucial for soil testing and material evaluation in engineering contexts.