Symbolic information about Pap is communicated in various ways when he first appears in The Adventures of Huckleberry Finn.
His hair is as dirty and unkempt as the rest of his appearance, with "his eyes shining through like he was behind vines" - this is a man who spends much of his time sneaking about and hiding, spying for an opportunity to make enough to buy his next drink.
The skin of his face was "white to make a body sick, a white to make a body's flesh crawl-a tree-toad white, a fish-belly white." Pap dies after being shot in the back; his naked body is abandoned in the frame house that floats down the river past Huck and Jim - a fate guaranteed to make anyone's flesh crawl.
The book Huck uses to demonstrate his ability to read is about George Washington. Pap suspected Huck was lying when he said he could read, but Huck proved the truth of his claim by reading about a president who supposedly never told a lie.