Cartoonist Keith Knight (under the name Keef), in his K Chronicles of April 27, uses a scheme for avoiding taboo words that was new to me:
(Thanks to Ben Zimmer for an improved image of the strip.)
The strip was circulated under the title “Sh_tless Babies”, which uses the common technique of an avoidance character (here, the underscore) in place of a letter. The strip itself uses a technique borrowed from visual modesty — the white rectangle superimposed on the offending material, which in the case of visual images is the “naughty bits” of the body (women’s breasts, both sexes’ genitalia).
Here the white rectangle of modesty covers not only the letter I, but the sequence IT. All is not hidden, however; Keef has left the dot on the I and the top part of the T peeking over the top of the rectangle, rather like bits of suggestive pubic hair (most clearly the last time through, in “No shit, Sherlock!!”).