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A conference of the parties (COP; French: Conférence des Parties, CP) is the governing body of an international convention.
The 2019 United Nations Climate Change Conference, also known as COP25, is the 25th United Nations Climate Change conference. It is being held in Madrid, Spain, from 2 to 13 December 2019 under the presidency of the Chilean government. The conference incorporates the 25th Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC), the 15th meeting of the parties for the Kyoto Protocol (CMP15), and the second meeting of the parties for the Paris Agreement (CMA2).

Last week's word

noun (plural elves /elvz/)
a supernatural creature of folk tales, typically represented as a small, elusive figure in human form with pointed ears, magical powers, and a capricious nature:
with his pointed chin, he might have been an elf out of story-land.

Christmass elf - Santa's elf
In American, Canadian, Irish, and British cultures, a Christmas elf is a diminutive elf that lives with Santa Claus at the North Pole and acts as his helper. Christmas elves are often depicted as green or red clad with large, pointy ears and pointy hats. Santa's elves are often said to make the toys in Santa's workshop and take care of his reindeer, among other tasks.

elf /elf/
birthmarks were thought to be bruises left by elves: PIXIE, fairy, sprite, imp, brownie; dwarf, gnome, goblin, hobgoblin; leprechaun, puck, troll; Irish Sidhe; rare nix, nixie.

Old English, of Germanic origin; related to German
Alp ‘nightmare’.