RSI Sia

This script is a custom indicator for TradingView written in Pine Script version 5. It calculates the Relative Strength Index (RSI) and uses it to generate trading signals. Here's a breakdown of what the script does:
Key Features:

RSI Calculation:
The script calculates the RSI using a 14-period window.
It also calculates the momentum of the RSI over a 9-period window (rsi delta) and a simple moving average (SMA) of the RSI over a 3-period window (rsi sma).

Composite Index (CI):
The composite index is calculated as the sum of rsi delta and rsi sma.

Horizontal Lines and Zones:
Several horizontal lines are plotted at different levels (e.g., 20, 40, 60, 80, 120, 150, 180) to indicate overbought and oversold conditions.
Filled zones are created between certain levels to highlight areas of interest.

Moving Averages:
The script plots SMA and EMA of the RSI when Enable RSI ma is set to true.
It also plots moving averages of the composite index.

Crossover Signals:
The script detects bullish and bearish crossovers between the SMA and EMA of the RSI.
It plots shapes (labels) on the chart to indicate buy (BUY) and sell (SELL) signals based on these crossovers.

Usage:

Enable RSIma: This input allows you to enable or disable the plotting of RSI moving averages.
i1: This variable is used to adjust the vertical position of the composite index and its moving averages.

Visualization:

The RSI is plotted in black.
The RSI fast trigger line (SMA of RSI) is plotted in green when enabled.
The RSI slow trigger line (EMA of RSI) is plotted in orange when enabled.
The composite index and its moving averages are plotted in red, green, and orange.
Buy and sell signals are indicated with green and red labels, respectively.

This script can be used to identify potential trading opportunities based on RSI crossovers and the composite index.