@samp{3}, @samp{=}, and the space character (denoted as @key{SPC}),
are entered by typing the corresponding key. @dfn{Control
characters}, such as @key{RET}, @key{TAB}, @key{DEL}, @key{ESC},
@samp{3}, @samp{=}, and the space character (denoted as @key{SPC}),
are entered by typing the corresponding key. @dfn{Control
characters}, such as @key{RET}, @key{TAB}, @key{DEL}, @key{ESC},