Small cycle generally refers to the number of days, such as 4H, 60min, 30min, 15, 5, 1, etc. However, a small period is relative to a large period. For example, if you are an intraday ultra-short-term trading, then the big cycle refers to the daily line, weekly line, 60-minute line and so on. And the small period is 30 points, 15 points, 5 points and so on. If you are a long-term trader, then your big cycle refers to week, month, half a year, year and so on. And your small period refers to days, 4H, or weeks.