This is a poster that was presented that the MecaNano conference 2024. https://mecanano2024.sciencesconf.org/ In the field of nanoindentation, a critical challenge has been the lack of standardized terminology and data interpretation frameworks, hindering effective collaboration and replication of experiments across different laboratories. To address this, in this work a Nanoindentation ontology has been developed, offering a structured knowledge framework that not only facilitates the exchange of information but also supports the semantic documentation of experiments in an interoperable manner. Central to this ontology is the establishment of a widely accepted taxonomy for nanoindentation, which delineates a clear and organized classification of concepts, processes, and entities within this domain, from sample preparation to postprocessing procedures. Conceived as part of the NanoMECommons European project, the CHAMEO ontology endeavors to harmonize the protocols used in characterisation studies. Rooted in the CHAMEO framework, the Nanoindentation ontology leverages a unified language and approach to data management, established by the CEN Workshop Agreement (CWA 17815) and the Characterisation Data (CHADA) documentation scheme. This framework is meticulously crafted to encapsulate the shared elements found across a spectrum of characterisation methods. Its design allows for the strategic development of specific ontologies tailored to individual methodologies through the thoughtful adaptation and refinement of CHAMEO's core components. This endeavor is a key component of the European Materials Modelling Council's (EMMC) ambitious initiative to forge a network of interconnected materials modelling ontologies, all anchored by the foundational principles of the Elementary Multiperspective Material Ontology (EMMO).