caliper:2

Azure, a falcon's head erased between in chief two compasses Or and in base a feathered serpent fesswise, describing a line embattled grady to base, argent. Ferris Nelson of the Falcon (7/1980 Aten)

Azure, in bend three mallets between two bendlets all between two pairs of compasses argent. Ferdinand of Strasburg (4/2007 Calo)

Azure, in pale two wolf's heads erased addorsed and conjoined at the neck argent and two calipers in chevron inverted the chiefmost prongs crossed Or. Borealis, Barony of (12/1999 AnTi)

Gules, a Latin cross bottony between in bend two pairs of compasses and in bend sinister two winged grenades Or. Joseph of Aberdeen (8/1996 Atla)

Per saltire argent and gules, two Maltese crosses sable and two pairs of compasses argent. William Scolari (1/2010 Atla)