Whats a reverse split, i heard sirius (siri) is going to do it?

Usually stocks will split to make it 1:2 or 1:3 based on certain scenarios like high value of the stock, number of out standing stocks, liquidity etc. For example CTSH went for split when the stock reached about 80 plus. On the other hand when stock prices are very low or similar reasons one will go for reverse split making 2:1 or 4:1 like that. JAVA (Sun Microsystems) went for 4:1 reverse split to make 1 stock of about 20 dollars when the stock price went about $5. SIRI is trading just 12 cents, whcih is very low and so they would go for reverse split.. which will make the stock price little higher.