HP 48gII - Manual (Page 759)

Page 23-2
Examples of application of these functions to strings are shown next:
String concatenation
Strings can be concatenated (joined together) by using the plus sign +, for
example:
Concatenating strings is a practical way to create output in programs. For
example, concatenating "YOU ARE " AGE + " YEAR OLD" creates the string
"YOU ARE 25 YEAR OLD", where 25 is stored in the variable called AGE.
The CHARS menu
The CHARS sub-menu is accessible through the PRG (programming) menu, i.e.,
„°.
The functions provided by the CHARS sub-menu are the following: