Do you mean the exclamation mark that appears over a Tamagotchi's head on the Music Star/V6 or the Tama-Go? When that happens, your Tamagotchi needs attention.
Try pressing any button. If that doesn't solve the problem, try the icons. The Health Meter will tell you if your Tamagotchi is stressed/unfriendly towards you, hungry and/or unhappy.
On the V6, if the Music Notes icon is highlighted as well as the exclamation mark over the Tamagotchi's head, that means it's time to perform in a concert. Also on V6, the Door icon may be highlighted, and if they are, somebody's at the door.
If that's fine, try punishing your Tamagotchi (or punishing/praising it on the Tama-Go; it's random whether you punish or praise on Tama-Go) using the Training Icon, and Time-Out/Punish.
If you don't mean the attention symbol, do you mean "Tamagotchi!", the anime based on Tamagotchi, the virtual pet? If so, nothing really. ;)
If that's not it, I'm not sure what you mean. :)
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