what does Is stand for chevy

For Chevy, “SS” is the famous one (“Super Sport”), but “IS” is not a standard, widely used Chevrolet trim or performance code like SS, LT, RS, or ZL1.

Most likely, the “IS” you saw is one of these:

• A misread or typo for LS (a common Chevy trim and also the name of their small‑block V8 engine family).

• A misheard version of RS (Rally Sport), another common appearance/performance package designation on Camaros and other models.

• A dealer- or shop-level shorthand, sticker, or custom badge with no official GM meaning (for example, a regional package or tuner label).

Chevrolet’s official, commonly recognized letter codes include things like SS (Super Sport), RS (Rally Sport), LT (Luxury Touring), ZR1, ZL1, etc., but “IS” is not on that mainstream list.

So: in normal Chevy usage, “IS” doesn’t officially stand for anything the way SS stands for “Super Sport.” It’s almost certainly a confusion with LS or RS, or an unofficial/custom label.

Information gathered from public forums or data available on the internet and portrayed here.