Charm refers to an object, act or words believed to have magic power (usually carries a positive connotation). It commonly describes the ability to persuade, delight or arouse admiration; often constructed in the plural, a small trinket on a bracelet or chain, etc., traditionally supposed to confer luck upon the wearer, and a quantum number of hadrons determined by the number of charm quarks and antiquarks, which gives the term a broader and more practical sense than a single short definition would suggest. Depending on context, it can also point to a second-order measure of derivative price sensitivity, expressed as the instantaneous rate of change of delta with respect to time, the mixed sound of many voices, especially of birds or children, and a flock, group (especially of finches), so the category can cover literal uses, related ideas, and more figurative extensions of the same core meaning. Taken together, these meanings present Charm as a flexible theme rather than a narrowly technical label, covering the central idea people usually mean when they use the word while still leaving room for closely related senses that appear in real language. Additional shades of meaning include to seduce, persuade or fascinate someone or something, to use a magical charm upon; to subdue, control, or summon by incantation or supernatural influence, to protect with, or make invulnerable by, spells, charms, or supernatural influences, to make music upon, and to subdue or overcome by some secret power, or by that which gives pleasure; to allay; to soothe, which reinforce how the category can stretch across adjacent but still recognizable uses of the same term.
