double vertical line

double vertical line (plural double vertical lines)

1. Used other than with a figurative or idiomatic meaning: see double,‎ vertical,‎ line.
   • 2007, K. David Harrison, When Languages Die:The Extinction of the World's Languages and the Erosion of Human Knowledge, page 39:

     The ǁGana people (800 speakers—the double vertical line denotes a click sound) of Botswana have no generic word for living things, nor do they recognize a plant versus animal distinction.

   • 2008, Ursula Goldenbaum, Douglas Jesseph, Infinitesimal Differences: Controversies between Leibniz and his Contemporaries →ISBN, page 86:

     In addition, Leibniz drew a double vertical line from line 36 to 37 (from “solidum est” to “Mechanice”[)].

2. The typographical character ‖; a symbol composed of two closely spaced line-height vertical lines.
   • 1998, Burkhard Dretzke, Modern British and American English Prononunciation: A Basic Textbook, page 89:

     The whole tone unit stands between a double vertical line (double bars) ||.