IBM NFS/DFS Secure Gateway Reference Manual page 9

<Ctrl- x> or |x
The notation <Ctrl- x> or |x followed by the name of a key indicates
a control character sequence. For example, <Ctrl-C> means that you
hold down the control key while pressing <C>.
<Return>
The notation <Return> refers to the key on your terminal or
workstation that is labeled with the word Return or Enter, or with a
left arrow.
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Preface