$^ - Perldoc Browser

#HANDLE->format_top_name(EXPR)

#$FORMAT_TOP_NAME

#$^

The name of the current top-of-page format for the currently selected output channel. The default is the name of the filehandle with _TOP appended. For example, the default format top name for the STDOUT filehandle is STDOUT_TOP.

Mnemonic: points to top of page.

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