Miscellaneous Symbols is a Unicode block (U+2600âU+26FF) containing glyphs representing concepts from a variety of categories, astrological, astronomical, chess, dice, musical notation, political symbols, recycling, religious symbols, trigrams, warning signs, and weather, among others.iscellaneous Symbols is a Unicode block (U+2600âU+26FF) containing glyphs representing concepts from a variety of categories, astrological, astronomical, chess, dice, musical notation, political symbols, recycling, religious symbols, trigrams, warning signs, and weather, among others.
reactant. 1  a person or thing that reacts. 2  Also called interactant. Chemistry. any substance that undergoes a chemical change in a given reaction.
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.he general concept of a chemical reaction has been extended to reactions between entities smaller than atoms, including nuclear reactions, radioactive decays, and reactions between elementary particles as described by quantum field theory.