HP (Hewlett-Packard) 50g ユーザーズマニュアル

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Selecting any of these entries will place the value selected, whether a symbol 
(e.g., ei,
π, MINR, or MAXR) or a value (2.71.., (0,1), 3.14.., 1E-499, 
9.99..E499) in the stack.
Please notice that e is available from the keyboard as exp(1), i.e., 
„¸1`
, in ALG mode, or  1` „¸, in RPN mode.  Also, 
π
is available directly from the keyboard as „ì.  Finally, i is available by 
using „¥.
Operations with units
Numbers in the calculator can have units associated with them.  Thus, it is 
possible to calculate results involving a consistent system of units and produce  
a result with the appropriate combination of units.   
The UNITS menu
The units menu is launched by the keystroke combination ‚Û(associated 
with the 6 key).  With system flag 117 set to CHOOSE boxes, the result is 
the following menu:
     
Option 1. Tools.. contains functions used to operate on  units (discussed later).  
Options 3. Length..  through 17.Viscosity.. contain menus with a number of units 
for each of the quantities described.  For example, selecting option 8. Force..
shows the following units menu: