Vero was first mentioned at henua ora in this dictionary, where it was suggested the rongorongo creators could have used the vero glyph type to indicate the 'death' of a season. The 'spear' should 'kill' it:

Vero

To throw, to hurl (a lance, a spear). This word was also used with the particle kua preposed: koía kua vero i te matá, he is the one who threw the obsidian [weapon]. Verovero, to throw, to hurl repeatedly, quickly (iterative of vero). Vanaga.

1. Arrow, dart, harpoon, lance, spear, nail, to lacerate, to transpierce (veo). P Mgv.: vero, to dart, to throw a lance, the tail; verovero, ray, beam, tentacle. Mq.: veó, dart, lance, harpoon, tail, horn. Ta.: vero, dart, lance. 2. To turn over face down. 3. Ta.: verovero, to twinkle like the stars. Ha.: welowelo, the light of a firebrand thrown into the air. 4. Mq.: veo, tenth month of the lunar year. Ha.: welo, a month (about April). Churchill.

Sa.: velo, to cast a spear or dart, to spear. To.: velo, to dart. Fu.: velo, velosi, to lance. Uvea: velo, to cast; impulse, incitement. Niuē: velo, to throw a spear or dart. Ma.: wero, to stab, to pierce, to spear. Ta.: vero, to dart or throw a spear. Mg.: vero, to pierce, to lance. Mgv.: vero, to lance, to throw a spear. Mq.: veo, to lance, to throw a spear. Churchill 2.

At vaero (the tail) I commented upon its similarity with vero and referred to Hawaii:

... A vestige of the practice of putting the king to death at the end of a year's reign appears to have survived in the festival called Macahity, which used to be celebrated in Hawaii during the last month of the year. About a hundred years ago a Russian voyager described the custom as follows: 'The taboo Macahity is not unlike to our festival of Christmas. It continues a whole month, during which the people amuse themselves with dances, plays, and sham-fights of every kind. The king must open this festival wherever he is.

On this occasion his majesty dresses himself in his richest cloak and helmet, and is paddled in a canoe along the shore, followed sometimes by many of his subjects. He embarks early, and must finish his excursion at sunrise. The strongest and most expert of the warriors is chosen to receive him on his landing. The warrior watches the canoe along the beach; and as soon as the king lands, and has thrown off his cloak, he darts his spear at him, from a distance of about thirty paces, and the king must either catch the spear in his hand, or suffer from it: there is no jesting in the business ...

On Marquesas the 10th month was veo, while vaero was spelled veó:

Vaero

Chicken's long tail feather; lobster's antenna (vaero ura). Vanaga.

Tail of a kite, tail of a bird (uero). T Pau.: tuavaero, rump; kaero, tail. Mgv.: vero, tail. Mq.: veó, id. Ta.: aero, id. Churchill.