This is the 7177th most frequent Russian word.
вцик
"Вцик" is an abbreviation for "Всероссийский Центральный Исполнительный Комитет" (All-Russian Central Executive Committee), the highest governing body in Soviet Russia from 1917 to 1936.
In this sentence, 'ВЦИК' is used as an acronym for a historical committee in Russia.
ВЦИК — это всероссийский центральный исполнительный комитет.
VTSIK is the All-Russian Central Executive Committee.
Here, 'ВЦИК' refers to the institution as part of historical context and usage.
Моя бабушка рассказывала, как в её время обращались к ВЦИК за помощью.
My grandmother told me how in her time they referred to the VTSIK for help.
'ВЦИК' is being explained as an abbreviation, leading to educational explanation.