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SR button

From SmashWiki, the Super Smash Bros. wiki
SR Button in the bottom-left part of diagram.

The SR button refers to the right shoulder button on the Joy-Con, when it is detached from the Nintendo Switch. A strap can be attached to the Joy-Con in order to make it easier to press the button. It serves as an equivalent to the R button, acting as a shoulder trigger. In Ultimate, it is used for shielding attacks, much like how the R button is solely used for shielding in Super Smash Bros. for Nintendo 3DS. It is present on both the left and right Joy-Con controllers.