What is this swastika looking symbol in John Hancock's family papers from circa 1762

I am free & determined to be so & will not willingly & quietly subject myself to slavery.

& = "and"

I am free and determined to be so and will not willingly and quietly subject myself to slavery.

Look carefully at the circled symbols in the document. You can see that the first and last are clearly the standard ampersand symbol &. The other two are sketchy versions where I guess the pen has for an instant lifted off the paper.

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Now look at the following. I have added to the less clear ones without overwriting any part of them to show that they have the same form.

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