This sign is good to use if you mean principal as in the leader
of a school or "the school principal."
Touch the tip of the middle finger of the "P-hand" to the back of a
palm-down S-hand twice.
This sign refers to the person "principal" of a school. The sign "principle"
spelled with an "le" instead of "al" uses a different sign.
If you mean some other type of "principal" (other than the leader
of a school) you should use a different sign than the "P" on the
back of the fist. For example:
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ASL resources by Lifeprint.com © Dr. William Vicars