Which symbol indicates peat and highly organic soil?

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The symbol that indicates peat and highly organic soil is PT. This designation is part of the Unified Soil Classification System (USCS), which categorizes soil based on its grain size, plasticity, and organic content. Peat, which is a type of organic soil formed from decomposed plant material, is identified by the abbreviation PT to signify its unique characteristics, including high organic matter content and distinctive physical properties. Understanding this classification helps engineers and geotechnical professionals accurately identify and assess soil conditions for construction and environmental considerations.

The other symbols represent different types of soil or classifications that don't specifically denote peat or high organic content. H typically corresponds to highly plastic soils, CL denotes clay soils with low plasticity, and OH refers to organic clays. Since none of these relate specifically to peat, they are not the correct choice for identifying peat and highly organic soil.