a rod, shepherd's hook, bishop's staff, scepter, or something similar (see Molina)
Alonso de Molina:
yacachicoltic topilli. vara, o gancho de pastor, o baculo de obispo, o cosa semejante. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 30r. col. 1. Thanks to Joe Campbell for providing the transcription.