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Comments

Forth supports two styles of comment; the traditional in-line comment, ( and its modern cousin, the comment to end of line; \.

(       compilation 'ccc<close-paren>' -- ; run-time --         core,file       ``paren''
Comment, usually till the next ): parse and discard all subsequent characters in the parse area until ")" is encountered. During interactive input, an end-of-line also acts as a comment terminator. For file input, it does not; if the end-of-file is encountered whilst parsing for the ")" delimiter, Gforth will generate a warning.
\       compilation 'ccc<newline>' -- ; run-time --         core-ext,block-ext       ``backslash''
Comment till the end of the line if BLK contains 0 (i.e., while not loading a block), parse and discard the remainder of the parse area. Otherwise, parse and discard all subsequent characters in the parse area corresponding to the current line.
\G       compilation 'ccc<newline>' -- ; run-time --         gforth       ``backslash-gee''
Equivalent to \ but used as a tag to annotate definition comments into documentation.