n.
an arbitrary sign (written or printed) that has acquired a conventional significance
something visible that by association or convention represents something else that is invisible
"the eagle is a symbol of the United States"
同义词：symbolizationsymbolisationsymbolic representation
Bone histomorphometry: standardization of nomenclature, symbols, and units. Report of the ASBMR Histomorphometry Nomenclature Commit...
Bone histomorphometry: standardization of nomenclature, symbols and units (summary of proposed system).
Skills, rules, and knowledge; signals, signs, and symbols, and other distinctions in human performance models
Culture in Action: Symbols and Strategies
Symbols, abbreviations and units. Working Party Standardization of Lung Function Tests, European Community for Steel and Coal.
Symbols for rock-forming minerals
Computer science as empirical inquiry: Symbols and search
Bringing Society Back In: Symbols, Practices, and Institutional Contradictions
Electronic Transport in Mesoscopic Systems: A few common symbols
Continuous Lattices and Domains: List of Symbols
