One site I found said they mean this so take it with a grain of salt. I have no idea if this is accurate or not.
100 I need shares. 200 I need shares badly,but do not take the stock down. 300 Take the price down so I can load shares 400 Keep trading it sideways. 500 Gap the stock. This gap can be either up or down, depending on the direction of the 500 signal. 600 means provide resistance 900 means let the stock float.