TL;DR:
A SIMD value is called a vector. […] A SIMD vector has a fixed size, known at compile time. [ A] vector is generally aligned to its entire size.
A single element position within a [SIMD] vector is called a lane
The extra-wide registers that are used for SIMD operations are commonly called vector registers, […] “SIMD registers”, vendor names for specific features, or even “floating-point register”
When an operation is “vertical”, each lane processes individually without regard to the other lanes in the same vector.
- Other operations can “reduce” all lanes to a single value.
- different chips have different architecture-specific SIMD registers