What is S1 a notation for?

[Browiththefro]

I know a lot of the notation except S1. My guess was standing 1 but I feel that would just be 1 without a direction before it. Thanks in advance!

Thanks for the quick answers! Cleared up that one for me. I appreciate it

 

[Braindead]

It is standing 1. Sometimes it's used instead of just 1, but both are the same.

 

[Gesture Required Ahead]

Yea just synonym. Can be said for other standing normals

 

[Compbros]

It can be confusing since people use both 1 and S1 but S1 is usually used when talking about punishes/anti-airs and 1 is usually used for strings.