The scorpion is a venomous arthropod, treated as an insect for heraldic purposes; its medieval reputation was of viciousness and treachery. It’s found in the canting arms of de Scorpionis, mid-15th C. [Triv 325], and the arms of Cole, c.1520 [DBA2 395].
The scorpion is tergiant, tail to base by default. We have an example of scorpions tergiant inverted, in the arms of Cole, 1610 [Guillim1 153]; scorpions tergiant inverted are considered consonant with period practice in the Society. See also crab.
Albrecht Waldfurster bears: Purpure, a scorpion argent.
Aurelia Nomadikē bears: Gules, three scorpions Or.
Juan Diego de Belmont bears: Argent chapé gules, a scorpion inverted sable.