The Search Direction mode

The directions for search and replace operations (p. [*]) can be set to:

The forward and reverse modes apply to single and multiple replaces respectively in a search and replace command (see p. [*] and p. [*]). The third character indicates which of these options is set.

The Alt-D command and the Alt-E command toggle circularly in opposite directions among the various printer options.

The circular mode is represented either by a zero or an $\infty $ sign, depending on whether the local font has an infinity sign.