The president himself made an appearance at the company picnic.
The word 'himself' is a reflexive pronoun in the above sentence.
Explanation:
A reflexive pronoun is a pronoun which uses a pronoun to show that the action done has been done on the noun or the pronoun in the sentence. self or selves is added after the pronoun to make it a reflexive pronoun. In the above sentence the word 'himself' tells about that the work done affects the noun.
