Nuts are identified with dots:

Guitars:

1 dot = gauge 9-42 to 9-46
🎸 9–42 (Extra Light)
1st (E): .009
2nd (B): .011
3rd (G): .016
4th (D): .024
5th (A): .032
6th (E): .042

🎸 9–46 (Hybrid Light Top / Heavy Bottom)
1st (E): .009
2nd (B): .011
3rd (G): .016
4th (D): .026
5th (A): .036
6th (E): .046

2 dots = gauge 10-52
🎸 10–52 (Hybrid Regular / Heavy Bottom)
1st (E): .010
2nd (B): .013
3rd (G): .017
4th (D): .030
5th (A): .042
6th (E): .052

3 dots = gauge 12-56
🎸 12–56 (Heavy or Jazz)
1st (E): .012
2nd (B): .016
3rd (G): .024
4th (D): .032
5th (A): .044
6th (E): .056

4 String Basses

1 dot= gauge 40–95
🎸 40–95
1st (G) : .040
2nd (D) : .060
3rd (A) : .075
4th (E) : .095

2 dots= gauge 45–100
🎸 45–100
1st (G) : .045
2nd (D) : .065
3rd (A) : .080
4th (E) : 100

3 dots= gauge 50–105
🎸 50–105
1st (G) : .050
2nd (D) : .070
3rd (A) : .085
4th (E) : 105

5 String Basses

1 dot= gauge 40–120
🎸 40–120
1st (G) : .040
2nd (D) : .060
3rd (A) : .075
4th (E) : .095
5th (B) :  120

2 dots= gauge 45–130
🎸   45–130
1st (G) : .045
2nd (D) : .065
3rd (A) : .080
4th (E) : 100
5th (B) : 130