gnus-summary-tool-bar-zap-list
gnus-summary-tool-bar-zap-list is a variable defined in `gnus-sum.el
'.
Its value is tDocumentation: List of icon items from the global tool bar. These items are not displayed in the Gnus summary mode tool bar. See `gmm-tool-bar-from-list' for the format of the list. You can customize this variable. This variable was introduced, or its default value was changed, in version 23.1 of Emacs.