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No, it is not.
Could be italic or possibly copperplate.
i is the symbol for an imaginary number, a complex number with the property i2=-1. The square root of a negative number is the square root times i. For example, the square root of -9 = 3i.
Some types of letter styles are block,ariel,cursive,bold,scriptand italic writing
The square root of negative one is an imaginary number, signified by the italic lower-case i.