PROJECT M6 CODENAME: INFINITY

Hydra uses it/its pronouns for M6, and refers to them as "Infinity" or "Asset" most of the time. 

SHIELD uses they/them pronouns and refers to them as M6 usually. 

Bucky refers to them as "M" for the most part. 

M6's trigger words, in order
“Одинокий” Lonely.
“Пурпурный” Purple.
“Двенадцать” Twelve.
“смеркаться” Dusk.
“Камин” Fireplace.
“Агрессия” Aggression.
“Потерял” Lost.
“Двадцать” Twenty.
“животное” Animal.
“Главная” Home.

The only spoken phrase M6 can say is "Готовы соблюдать" (Ready to comply) - in truth they don't know that they're speaking, but just making the closest sounds they can to these words. (If that makes sense) Their handlers taught them this phrase for the sole purpose of knowing if the brainwashing activation worked or not. M6 can't say this phrase if the brainwashing isn't activated.