: The data or calculation you want to retrieve from the specified symbol/timeframe (e.g., close , hl2 , or a custom function call).
The request.security function returns a series that contains the result of the expression expr evaluated on the requested security. pine script v5 request.security function documentation
request.security(symbol, timeframe, expression, gaps, lookahead, ignore_invalid_symbol, currency) : The data or calculation you want to