This gesture (reconstructed by me) corresponds to the sign atnah ("rest"). In Letteris and Ginsburg it appears as a bracket; in manuscripts and most other printed editions, as an upside-down "v". Either way, it appears to be an upside-down galgal: in a sense closed to the surrounding musical context, as galgal is open to that context.

Atnah (representing the 4th degree of the modal scale) is the ta`am of choice to indicate the melodic-verbal half cadence. In psalmody, however, galgal (and/or silluq in its role as "ga`ya", or sometimes other sublinear signs) followed by `oleh weyored and merkha may supersede even atnah in marking the strongest point of division within a verse (in verses where there are three phrases rather than the usual two). In effect, a suspensive cadence supplants the half cadence in that function in such verses.

Updated December 27, 2011