Spider Robinson once wrote about how he learned to give a good hug. (Paraphrased, but that avoids copyright problems anyhow.)
He was at a Science Fiction Convention when Theodore Sturgeon, who is apparently a master hugger, offered a hug. So Spider hugged him, and Theodore said, "Ah, a type A hug." Spider was puzzled by this term. As luck would have it, a fan of Theodore's work happened along, and Theodore offered a hug. After the hug, Spider observed him saying, "Ah, a type 1 hug." Curious about the meaning of the two terms, Spider asked Theodore what the difference was.
Theodore said that it was simple. A type A hug is hugging bodies apart, shoulders touching, arms wrapped together. It's shaped just like the letter "A". To make it more obvious:
However, a type 1 hug is hugging bodies together, touching, wrapped up against the other person. It's shapped just like the number "1" in Theodore's mind (and type 1 hug is easier to remember than type lowercase l hug). Or, to use ASCII graphics again:
Since then, Spider has tried to always give type 1 hugs, a practice I heartily endorse.