That thing you do to warn ur allies about an event, like a attacking enemy champion. You hold alt and click where you want on the map to warn your allies. In dota or HoN, huge colorful lights blinked for all the allies while a nice sound helped the warning. In LoL, a small yellow exclamation, almost irreparable, with a low volume sound is what happens as a warn.

Just a suggestion, but it should be changed. ^^

I agree! I have to spend like 3 sec to see where the warning is because it's so tiny. It was huge and nice in DOTA.

Well... a colorful swirl was perfect on dota, why not use something similar? If they want to make it different use growing boxes or something. ^^