The ACM Computing Classification System (1991)

C.1.2 Multiple Data Stream Architectures (Multiprocessors)

Array and vector processors
Associative processors
Connection machines
Interconnection architectures (e.g., common bus, multiport memory, crossbar switch)
Multiple-instruction-stream, multiple-data-stream processors (MIMD)
Parallel processors
Pipeline processors
Single-instruction-stream, multiple-data-stream processors (SIMD)