[Soultrader]

Terms are taken from Tony Crabel's famous book, "Day Trading with Short Term Price Patterns & Opening Range Breakout".
This book is extremely rare and close to impossible to find. I have seen copies being sold on ebay for close to $1000.

NR; Narrow Range - Today's trading range was narrower than the previous days range.
NR7; Narrow Range 7 - Similar to the NR. The range was the narrowest compared to the last 7 trading days.
WS; Wide Spread - Exact opposite of the NR. Today's trading range was wider than the previous days range.
WS7; Wide Spread 7 - Similar to the WS. The range was the widest compared to the last 7 trading days.

Inside Day - Price bar in which the high is lower than the previous days high AND the low is higher than the previous days low.
Outside Day - Price bar in which the high is higher than the previous days high AND the low is lower than the previous days low.
IDnr4 - An inside day with the narrowest trading range in the last 4 trading session's.

Bear Hook - NR with Open < Previous Low and Close > Previous Close.
Bull Hook - NR with Open > Previous High and Close < Previous Close.
Stretch - The 10 period SMA of the absolute difference between the open and either the high or low, whichever difference is smaller.

[Blaiserboy]

Thomas Bulkowski makes great use of NR7 Patterns for his forecasting of the markets

http://www.thepatternsite.com/CPIUpdate.html

[Kiwi]

Just a note on the Inside Bar definition.

It is very common to define it as "the price range must be entirely within the prior bars range" and thus the either:
( H<H[-1] and L>=L[-1] ) OR ( H<=H[-1] and L>L[-1] )

Some even allow an equal bar but most support the view that the bar must be smaller because the true value of the inside bar isn't that its got the name inside bar but that a bar within the range of the prior bar that has a lower range suggests the probability of indecision on the part of market participants. A second view of the value of an IB is that it offers an opportunity to enter with a small risk if you stop the other side of the bar.