Question

what is the meaning of vertical bars and expansion

Answer 1

The vertical bar is a computer character and glyph with various uses in mathematics, computing, and typography. It has many names, often related to particular meanings: Sheffer stroke (in logic), verti-bar, vbar, stick, vertical line, vertical slash, bar, obelisk, glidus, or pipe. On a QWERTY keyboard, the combination of the "shift" key ⇧ Shift and th…
the action of becoming larger or more extensive: "the rapid expansion of suburban Washington" · [more]"a small expansion of industry"synonyms: growth · increase in size · enlargement · extension · development · spread · proliferation · multiplicationantonyms: reduction in sizeextension of a state's territory by encroaching on that of other nations, pursued as a political strategy: "German expansion in the 1930s"a thing formed by the enlargement, broadening, or development of something: "the book is an expansion of a lecture given last year"synonyms: elaboration · enlargement · amplification · developmentantonyms: abridgment · summarythe increase in the volume of fuel on combustion in the cylinder of an engine, or the piston stroke in which this occurs.