HP (Hewlett-Packard) HP 33s ユーザーズマニュアル

The display comprises two lines and annunciators.

The first line can display up to 255 characters. Entries with more than 14 
characters will scroll to the left. However, if entries are more than 255 characters, 
the characters from the 256th onward are replaced with an ellipsis ()))). 

During inputting, the second line displays an entry; after calculating, it displays the 
result of a calculation. Every calculation is displayed in up to 14 digits, including 
an 

 sign (exponent), and exponent value up to three digits. 

The symbols on the display, shown in the above figure, are called annunciators.
Each one has a special significance when it appears in the display.