SCH stands for taxable scholarship. The number 1723 is the amount of the scholarship that is taxable, ie $1,723. It is added to the amount on Line 1 of the Form 1040.
See this TurboTax support FAQ for taxable scholarships - https://ttlc.intuit.com/community/college-and-education/help/why-is-my-scholarship-taxable/01/26267
