Definitions for "Touchstone"
Lydian stone; basanite; -- so called because used to test the purity of gold and silver by the streak which is left upon the stone when it is rubbed by the metal. See Basanite.
Any test or criterion by which the qualities of a thing are tried.
a black stone that was formerly used to judge the purity of gold or silver
Keywords:  syphon, sabriel, terrence, garth, nix
Touchstone is a character from Garth Nix's Old Kingdom trilogy. He is a central character in the first book, Sabriel, and appears in all three parts of the trilogy.
Touchstone is a fictional villain character in the Syphon Filter series of video games. His only game role was in the game Syphon Filter: Dark Mirror. Touchstone, voiced by Terrence "T.C."
an intentionally placed marker which draws the participant into the activity, making him or her an active participant in the session through creating a palpable connection between you - the participant-and the story itself
a basis for comparison; a reference point against which other things can be evaluated; "they set the measure for all subsequent work"
a standard by which to evaluate the worth of something
Keywords:  quality, measure, value
a measure of quality and value