I am new to basketball and have a question. What is a double thread(or double threat) Just wondering?

What is a double thread(or double threat, not sure what its called.) Just wondering. Sorry for the noobish question.

Double thread.

It is when you post the same question twice on accident.

WONDER THREAD GUIDE works on 99 of all Sewing Machines $19.95 Time Remaining: 3d 11h 46m Buy It Now for only: $19.95

WONDER THREAD GUIDE 4 Kenmore Embroidery Machines $19.95 Time Remaining: 4d 10h 10m Buy It Now for only: $19.95

WONDER THREAD GUIDE EXTENDER 4 Bernina 830 Sewing Machines $19.95 Time Remaining: 7d 6h 8m Buy It Now for only: $19.95

WONDER THREAD GUIDE works on Pfaff Sewing Machines $19.95 Time Remaining: 12d 12h 55m Buy It Now for only: $19.95

WONDER THREAD GUIDE works on Bernina Sewing Machines $19.95 Time Remaining: 12d 12h 57m Buy It Now for only: $19.95

WONDER THREAD GUIDE works on HusqViking Designer 1 2 $19.95 Time Remaining: 12d 13h 2m Buy It Now for only: $19.95

WONDER THREAD GUIDE works on Baby Lock Ellisimo+others $19.95 Time Remaining: 12d 13h 6m Buy It Now for only: $19.95

WONDER THREAD GUIDE 4 BabyLock Ellisimo Sewing Embroid $19.95 Time Remaining: 13d 2h 33m Buy It Now for only: $19.95

WONDER THREAD GUIDE use with Janome Embroidery Machines $19.95 Time Remaining: 13d 2h 40m Buy It Now for only: $19.95

WONDER THREAD GUIDE works on 99 of all Sewing Machines $19.95 Time Remaining: 13d 11h 28m Buy It Now for only: $19.95

WONDER THREAD GUIDE WORKS ON BERNINA 830 Sewing and $19.95 Time Remaining: 16d 2h 49m Buy It Now for only: $19.95

Tru Ball Extender WTGuide 4 BERNINA 830 Machines $39.90 Time Remaining: 17d 8h 8m Buy It Now for only: $39.90

WONDER THREAD GUIDE WORKS ON BERNINA 830 Sewing and $19.95 Time Remaining: 24d 2h 54m Buy It Now for only: $19.95