If anyone knows what this is, please and thanks.

Answer:
1.093
Step-by-step explanation:
A "sine regression model" is a model of a sine function with 4 different parameters normally named as: [tex]a, b, c,[/tex] and [tex]d.[/tex] that is returned to the user after trying to fit a set of numerical values using a sinusoidal function.
The model and parameters are normally defined as follows:
[tex]y=a*sin(bx+c) + d[/tex]
The parameters [tex]a, b, c,[/tex] and [tex]d[/tex] are associated with different geometric characteristics of the modeling function. For example, [tex]a[/tex] is associated with the function's amplitude, [tex]b[/tex] with the function's period via the relationship: [tex]period=\frac{2\pi }{b}[/tex], [tex]c[/tex] with the function's horizontal shift via the relationship: [tex]H_s= \frac{|c|}{b}[/tex] to the right if [tex]c[/tex] is a negative number, and to the left if [tex]c[/tex]c is a positive number. and [tex]d[/tex] with the function's vertical shift.
So looking at your functional expression,
[tex]c[/tex] is represented in absolute value by the number 1.093 that appears in the argument of the sine function,and indicates that there is a shift to the right from the standard sine function.