C-Pen 800C User Manual page 41

When using a C-Pen with an automatic trigger, press the
pen tip briefly against the surface to enter symbol mode.
The Autotrigger at the rim of the pen must be pressed into
the pen.
The status field displays the Symbol mode icon.
Write one of the symbols in the symbol table.
After writing a symbol, C-Pen automatically
returns to normal mode.
C Write symbol mode icon
If you want to quit symbol mode without writing a symbol,
you have to draw a backspace symbol.
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