Up! Button
This is a sign with English letters. It surrounds "UP" with an outer frame, and there is an "exclamation mark" behind the letter.
Different platforms depict different signs, except that JoyPixels platform adopts a frame shape similar to a house, au by KDDI platform and Docomo platform depict two parallel lines above and below letters, and other platforms adopt square frames. In addition, most platforms use blue or blue-gray frame background, and only a few platforms depict green or red frames.
This emoji was originally used to express the upgrade in the game, and it can also mean uploading and updating.
